Merge pull request 'feat(web): chat interface — model selector, keybindings, thinking display, v0 styled header' (#216) from feat/ui-chat into main

Reviewed-on: mosaic/mosaic-stack#216

apps/web/package.json

@@ -18,6 +18,7 @@
     "next": "^16.0.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
+    "react-markdown": "^10.1.0",
     "socket.io-client": "^4.8.0",
     "tailwind-merge": "^3.5.0"
   },

apps/web/src/app/(dashboard)/chat/page.tsx

@@ -1,93 +1,172 @@
 'use client';
 
-import { useCallback, useEffect, useRef, useState } from 'react';
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { api } from '@/lib/api';
 import { destroySocket, getSocket } from '@/lib/socket';
-import type { Conversation, Message } from '@/lib/types';
+import type { Conversation, Message, ModelInfo, ProviderInfo } from '@/lib/types';
 import { ConversationList } from '@/components/chat/conversation-list';
 import { MessageBubble } from '@/components/chat/message-bubble';
 import { ChatInput } from '@/components/chat/chat-input';
 import { StreamingMessage } from '@/components/chat/streaming-message';
+import { AppHeader } from '@/components/layout/app-header';
+
+const FALLBACK_MODELS: ModelInfo[] = [
+  {
+    id: 'claude-3-5-sonnet',
+    provider: 'anthropic',
+    name: 'claude-3.5-sonnet',
+    reasoning: true,
+    contextWindow: 200_000,
+    maxTokens: 8_192,
+    inputTypes: ['text'],
+    cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+  },
+  {
+    id: 'gpt-4.1',
+    provider: 'openai',
+    name: 'gpt-4.1',
+    reasoning: false,
+    contextWindow: 128_000,
+    maxTokens: 8_192,
+    inputTypes: ['text'],
+    cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+  },
+  {
+    id: 'gemini-2.0-flash',
+    provider: 'google',
+    name: 'gemini-2.0-flash',
+    reasoning: false,
+    contextWindow: 1_000_000,
+    maxTokens: 8_192,
+    inputTypes: ['text', 'image'],
+    cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+  },
+];
 
 export default function ChatPage(): React.ReactElement {
   const [conversations, setConversations] = useState<Conversation[]>([]);
   const [activeId, setActiveId] = useState<string | null>(null);
   const [messages, setMessages] = useState<Message[]>([]);
+  const [sidebarOpen, setSidebarOpen] = useState(true);
+  const [models, setModels] = useState<ModelInfo[]>(FALLBACK_MODELS);
+  const [selectedModelId, setSelectedModelId] = useState(FALLBACK_MODELS[0]?.id ?? '');
   const [streamingText, setStreamingText] = useState('');
+  const [streamingThinking, setStreamingThinking] = useState('');
   const [isStreaming, setIsStreaming] = useState(false);
   const messagesEndRef = useRef<HTMLDivElement>(null);
-
-  // Track the active conversation ID in a ref so socket event handlers always
-  // see the current value without needing to be re-registered.
   const activeIdRef = useRef<string | null>(null);
+  const streamingTextRef = useRef('');
+  const streamingThinkingRef = useRef('');
+
   activeIdRef.current = activeId;
 
-  // Accumulate streamed text in a ref so agent:end can read the full content
-  // without stale-closure issues.
-  const streamingTextRef = useRef('');
+  const selectedModel = useMemo(
+    () => models.find((model) => model.id === selectedModelId) ?? models[0] ?? null,
+    [models, selectedModelId],
+  );
+  const selectedModelRef = useRef<ModelInfo | null>(selectedModel);
+  selectedModelRef.current = selectedModel;
 
-  // Load conversations on mount
   useEffect(() => {
     api<Conversation[]>('/api/conversations')
       .then(setConversations)
       .catch(() => {});
   }, []);
 
-  // Load messages when active conversation changes
+  useEffect(() => {
+    api<ProviderInfo[]>('/api/providers')
+      .then((providers) =>
+        providers.filter((provider) => provider.available).flatMap((provider) => provider.models),
+      )
+      .then((availableModels) => {
+        if (availableModels.length === 0) return;
+        setModels(availableModels);
+        setSelectedModelId((current) =>
+          availableModels.some((model) => model.id === current) ? current : availableModels[0]!.id,
+        );
+      })
+      .catch(() => {
+        setModels(FALLBACK_MODELS);
+      });
+  }, []);
+
   useEffect(() => {
     if (!activeId) {
       setMessages([]);
       return;
     }
-    // Clear streaming state when switching conversations
+
     setIsStreaming(false);
     setStreamingText('');
+    setStreamingThinking('');
     streamingTextRef.current = '';
+    streamingThinkingRef.current = '';
+
     api<Message[]>(`/api/conversations/${activeId}/messages`)
-      .then(setMessages)
+      .then((fetchedMessages) => setMessages(fetchedMessages.map(normalizeMessage)))
       .catch(() => {});
   }, [activeId]);
 
-  // Auto-scroll to bottom
   useEffect(() => {
     messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' });
-  }, [messages, streamingText]);
+  }, [messages, streamingText, streamingThinking]);
 
-  // Socket.io setup — connect once for the page lifetime
   useEffect(() => {
     const socket = getSocket();
 
     function onAgentStart(data: { conversationId: string }): void {
-      // Only update state if the event belongs to the currently viewed conversation
       if (activeIdRef.current !== data.conversationId) return;
       setIsStreaming(true);
       setStreamingText('');
+      setStreamingThinking('');
       streamingTextRef.current = '';
+      streamingThinkingRef.current = '';
     }
 
-    function onAgentText(data: { conversationId: string; text: string }): void {
+    function onAgentText(data: { conversationId: string; text?: string; thinking?: string }): void {
       if (activeIdRef.current !== data.conversationId) return;
-      streamingTextRef.current += data.text;
-      setStreamingText((prev) => prev + data.text);
+      if (data.text) {
+        streamingTextRef.current += data.text;
+        setStreamingText((prev) => prev + data.text);
+      }
+      if (data.thinking) {
+        streamingThinkingRef.current += data.thinking;
+        setStreamingThinking((prev) => prev + data.thinking);
+      }
     }
 
-    function onAgentEnd(data: { conversationId: string }): void {
+    function onAgentEnd(data: {
+      conversationId: string;
+      thinking?: string;
+      model?: string;
+      provider?: string;
+      promptTokens?: number;
+      completionTokens?: number;
+      totalTokens?: number;
+    }): void {
       if (activeIdRef.current !== data.conversationId) return;
       const finalText = streamingTextRef.current;
+      const finalThinking = data.thinking ?? streamingThinkingRef.current;
       setIsStreaming(false);
       setStreamingText('');
+      setStreamingThinking('');
       streamingTextRef.current = '';
-      // Append the completed assistant message to the local message list.
-      // The Pi agent session is in-memory so the assistant response is not
-      // persisted to the DB — we build the local UI state instead.
+      streamingThinkingRef.current = '';
+
       if (finalText) {
         setMessages((prev) => [
           ...prev,
           {
             id: `assistant-${Date.now()}`,
             conversationId: data.conversationId,
-            role: 'assistant' as const,
+            role: 'assistant',
             content: finalText,
+            thinking: finalThinking || undefined,
+            model: data.model ?? selectedModelRef.current?.name,
+            provider: data.provider ?? selectedModelRef.current?.provider,
+            promptTokens: data.promptTokens,
+            completionTokens: data.completionTokens,
+            totalTokens: data.totalTokens,
             createdAt: new Date().toISOString(),
           },
         ]);
@@ -97,13 +176,15 @@ export default function ChatPage(): React.ReactElement {
     function onError(data: { error: string; conversationId?: string }): void {
       setIsStreaming(false);
       setStreamingText('');
+      setStreamingThinking('');
       streamingTextRef.current = '';
+      streamingThinkingRef.current = '';
       setMessages((prev) => [
         ...prev,
         {
           id: `error-${Date.now()}`,
           conversationId: data.conversationId ?? '',
-          role: 'system' as const,
+          role: 'system',
           content: `Error: ${data.error}`,
           createdAt: new Date().toISOString(),
         },
@@ -115,7 +196,6 @@ export default function ChatPage(): React.ReactElement {
     socket.on('agent:end', onAgentEnd);
     socket.on('error', onError);
 
-    // Connect if not already connected
     if (!socket.connected) {
       socket.connect();
     }
@@ -125,19 +205,17 @@ export default function ChatPage(): React.ReactElement {
       socket.off('agent:text', onAgentText);
       socket.off('agent:end', onAgentEnd);
       socket.off('error', onError);
-      // Fully tear down the socket when the chat page unmounts so we get a
-      // fresh authenticated connection next time the page is visited.
       destroySocket();
     };
   }, []);
 
   const handleNewConversation = useCallback(async () => {
-    const conv = await api<Conversation>('/api/conversations', {
+    const conversation = await api<Conversation>('/api/conversations', {
       method: 'POST',
       body: { title: 'New conversation' },
     });
-    setConversations((prev) => [conv, ...prev]);
-    setActiveId(conv.id);
+    setConversations((prev) => [conversation, ...prev]);
+    setActiveId(conversation.id);
     setMessages([]);
   }, []);
 
@@ -146,20 +224,22 @@ export default function ChatPage(): React.ReactElement {
       method: 'PATCH',
       body: { title },
     });
-    setConversations((prev) => prev.map((c) => (c.id === id ? updated : c)));
+    setConversations((prev) =>
+      prev.map((conversation) => (conversation.id === id ? updated : conversation)),
+    );
   }, []);
 
   const handleDelete = useCallback(
     async (id: string) => {
       try {
         await api<void>(`/api/conversations/${id}`, { method: 'DELETE' });
-        setConversations((prev) => prev.filter((c) => c.id !== id));
+        setConversations((prev) => prev.filter((conversation) => conversation.id !== id));
         if (activeId === id) {
           setActiveId(null);
           setMessages([]);
         }
-      } catch (err) {
-        console.error('[ChatPage] Failed to delete conversation:', err);
+      } catch (error) {
+        console.error('[ChatPage] Failed to delete conversation:', error);
       }
     },
     [activeId],
@@ -171,8 +251,9 @@ export default function ChatPage(): React.ReactElement {
         method: 'PATCH',
         body: { archived },
       });
-      setConversations((prev) => prev.map((c) => (c.id === id ? updated : c)));
-      // If archiving the active conversation, deselect it
+      setConversations((prev) =>
+        prev.map((conversation) => (conversation.id === id ? updated : conversation)),
+      );
       if (archived && activeId === id) {
         setActiveId(null);
         setMessages([]);
@@ -182,75 +263,114 @@ export default function ChatPage(): React.ReactElement {
   );
 
   const handleSend = useCallback(
-    async (content: string) => {
-      let convId = activeId;
+    async (content: string, options?: { modelId?: string }) => {
+      let conversationId = activeId;
 
-      // Auto-create conversation if none selected
-      if (!convId) {
+      if (!conversationId) {
         const autoTitle = content.slice(0, 60);
-        const conv = await api<Conversation>('/api/conversations', {
+        const conversation = await api<Conversation>('/api/conversations', {
           method: 'POST',
           body: { title: autoTitle },
         });
-        setConversations((prev) => [conv, ...prev]);
-        setActiveId(conv.id);
-        convId = conv.id;
+        setConversations((prev) => [conversation, ...prev]);
+        setActiveId(conversation.id);
+        conversationId = conversation.id;
       } else {
-        // Auto-title: if the active conversation still has the default "New
-        // conversation" title and this is the first message, update the title
-        // from the message content.
-        const activeConv = conversations.find((c) => c.id === convId);
-        if (activeConv?.title === 'New conversation' && messages.length === 0) {
+        const activeConversation = conversations.find(
+          (conversation) => conversation.id === conversationId,
+        );
+        if (activeConversation?.title === 'New conversation' && messages.length === 0) {
           const autoTitle = content.slice(0, 60);
-          api<Conversation>(`/api/conversations/${convId}`, {
+          api<Conversation>(`/api/conversations/${conversationId}`, {
             method: 'PATCH',
             body: { title: autoTitle },
           })
             .then((updated) => {
-              setConversations((prev) => prev.map((c) => (c.id === convId ? updated : c)));
+              setConversations((prev) =>
+                prev.map((conversation) =>
+                  conversation.id === conversationId ? updated : conversation,
+                ),
+              );
             })
             .catch(() => {});
         }
       }
 
-      // Optimistic user message in local UI state
       setMessages((prev) => [
         ...prev,
         {
           id: `user-${Date.now()}`,
-          conversationId: convId,
-          role: 'user' as const,
+          conversationId,
+          role: 'user',
           content,
           createdAt: new Date().toISOString(),
         },
       ]);
 
-      // Persist the user message to the DB so conversation history is
-      // available when the page is reloaded or a new session starts.
-      api<Message>(`/api/conversations/${convId}/messages`, {
+      api<Message>(`/api/conversations/${conversationId}/messages`, {
         method: 'POST',
         body: { role: 'user', content },
-      }).catch(() => {
-        // Non-fatal: the agent can still process the message even if
-        // REST persistence fails.
-      });
+      }).catch(() => {});
 
-      // Send to WebSocket — gateway creates/resumes the agent session and
-      // streams the response back via agent:start / agent:text / agent:end.
       const socket = getSocket();
       if (!socket.connected) {
         socket.connect();
       }
-      socket.emit('message', { conversationId: convId, content });
+      socket.emit('message', {
+        conversationId,
+        content,
+        model: options?.modelId ?? selectedModelRef.current?.id,
+      });
     },
-    [activeId, conversations, messages],
+    [activeId, conversations, messages.length],
   );
 
+  const handleStop = useCallback(() => {
+    const socket = getSocket();
+    socket.emit('cancel', { conversationId: activeIdRef.current });
+
+    const partialText = streamingTextRef.current.trim();
+    const partialThinking = streamingThinkingRef.current.trim();
+
+    if (partialText) {
+      setMessages((prev) => [
+        ...prev,
+        {
+          id: `assistant-partial-${Date.now()}`,
+          conversationId: activeIdRef.current ?? '',
+          role: 'assistant',
+          content: partialText,
+          thinking: partialThinking || undefined,
+          model: selectedModelRef.current?.name,
+          provider: selectedModelRef.current?.provider,
+          createdAt: new Date().toISOString(),
+        },
+      ]);
+    }
+
+    setIsStreaming(false);
+    setStreamingText('');
+    setStreamingThinking('');
+    streamingTextRef.current = '';
+    streamingThinkingRef.current = '';
+    destroySocket();
+  }, []);
+
+  const handleEditLastMessage = useCallback((): string | null => {
+    const lastUserMessage = [...messages].reverse().find((message) => message.role === 'user');
+    return lastUserMessage?.content ?? null;
+  }, [messages]);
+
+  const activeConversation =
+    conversations.find((conversation) => conversation.id === activeId) ?? null;
+
   return (
-    <div className="-m-6 flex h-[calc(100vh-3.5rem)]">
+    <div className="-m-6 flex h-[100dvh] overflow-hidden">
       <ConversationList
         conversations={conversations}
         activeId={activeId}
+        isOpen={sidebarOpen}
+        onClose={() => setSidebarOpen(false)}
         onSelect={setActiveId}
         onNew={handleNewConversation}
         onRename={handleRename}
@@ -258,36 +378,90 @@ export default function ChatPage(): React.ReactElement {
         onArchive={handleArchive}
       />
 
-      <div className="flex flex-1 flex-col">
-        {activeId ? (
-          <>
-            <div className="flex-1 space-y-4 overflow-y-auto p-6">
-              {messages.map((msg) => (
-                <MessageBubble key={msg.id} message={msg} />
-              ))}
-              {isStreaming && <StreamingMessage text={streamingText} />}
-              <div ref={messagesEndRef} />
-            </div>
-            <ChatInput onSend={handleSend} disabled={isStreaming} />
-          </>
-        ) : (
-          <div className="flex flex-1 items-center justify-center">
-            <div className="text-center">
-              <h2 className="text-lg font-medium text-text-secondary">Welcome to Mosaic Chat</h2>
-              <p className="mt-1 text-sm text-text-muted">
-                Select a conversation or start a new one
-              </p>
-              <button
-                type="button"
-                onClick={handleNewConversation}
-                className="mt-4 rounded-lg bg-blue-600 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-blue-700"
-              >
-                Start new conversation
-              </button>
-            </div>
+      <div
+        className="relative flex min-w-0 flex-1 flex-col overflow-hidden"
+        style={{
+          background:
+            'radial-gradient(circle at top, color-mix(in srgb, var(--color-ms-blue-500) 14%, transparent), transparent 35%), var(--color-bg)',
+        }}
+      >
+        <AppHeader
+          conversationTitle={activeConversation?.title}
+          isSidebarOpen={sidebarOpen}
+          onToggleSidebar={() => setSidebarOpen((prev) => !prev)}
+        />
+
+        <div className="flex-1 overflow-y-auto px-4 py-6 md:px-6">
+          <div className="mx-auto flex w-full max-w-4xl flex-col gap-4">
+            {messages.length === 0 && !isStreaming ? (
+              <div className="flex min-h-full flex-1 items-center justify-center py-16">
+                <div className="max-w-xl text-center">
+                  <div className="mb-4 text-xs uppercase tracking-[0.3em] text-[var(--color-muted)]">
+                    Mosaic Chat
+                  </div>
+                  <h2 className="text-3xl font-semibold text-[var(--color-text)]">
+                    Start a new session with a better chat interface.
+                  </h2>
+                  <p className="mt-3 text-sm leading-7 text-[var(--color-text-2)]">
+                    Pick a model, send a prompt, and the response area will keep reasoning,
+                    metadata, and streaming status visible without leaving the page.
+                  </p>
+                </div>
+              </div>
+            ) : null}
+
+            {messages.map((message) => (
+              <MessageBubble key={message.id} message={message} />
+            ))}
+
+            {isStreaming ? (
+              <StreamingMessage
+                text={streamingText}
+                thinking={streamingThinking}
+                modelName={selectedModel?.name ?? null}
+              />
+            ) : null}
+
+            <div ref={messagesEndRef} />
           </div>
-        )}
+        </div>
+
+        <div className="sticky bottom-0">
+          <div className="mx-auto w-full max-w-4xl">
+            <ChatInput
+              onSend={handleSend}
+              onStop={handleStop}
+              isStreaming={isStreaming}
+              models={models}
+              selectedModelId={selectedModelId}
+              onModelChange={setSelectedModelId}
+              onRequestEditLastMessage={handleEditLastMessage}
+            />
+          </div>
+        </div>
       </div>
     </div>
   );
 }
+
+function normalizeMessage(message: Message): Message {
+  const metadata = message.metadata ?? {};
+
+  return {
+    ...message,
+    thinking:
+      message.thinking ?? (typeof metadata.thinking === 'string' ? metadata.thinking : undefined),
+    model: message.model ?? (typeof metadata.model === 'string' ? metadata.model : undefined),
+    provider:
+      message.provider ?? (typeof metadata.provider === 'string' ? metadata.provider : undefined),
+    promptTokens:
+      message.promptTokens ??
+      (typeof metadata.prompt_tokens === 'number' ? metadata.prompt_tokens : undefined),
+    completionTokens:
+      message.completionTokens ??
+      (typeof metadata.completion_tokens === 'number' ? metadata.completion_tokens : undefined),
+    totalTokens:
+      message.totalTokens ??
+      (typeof metadata.total_tokens === 'number' ? metadata.total_tokens : undefined),
+  };
+}

apps/web/src/components/chat/chat-input.tsx

@@ -1,52 +1,192 @@
 'use client';
 
-import { useRef, useState } from 'react';
+import { useEffect, useMemo, useRef, useState } from 'react';
+import type { ModelInfo } from '@/lib/types';
 
 interface ChatInputProps {
-  onSend: (content: string) => void;
-  disabled?: boolean;
+  onSend: (content: string, options?: { modelId?: string }) => void;
+  onStop?: () => void;
+  isStreaming?: boolean;
+  models: ModelInfo[];
+  selectedModelId: string;
+  onModelChange: (modelId: string) => void;
+  onRequestEditLastMessage?: () => string | null;
 }
 
-export function ChatInput({ onSend, disabled }: ChatInputProps): React.ReactElement {
+const MAX_HEIGHT = 220;
+
+export function ChatInput({
+  onSend,
+  onStop,
+  isStreaming = false,
+  models,
+  selectedModelId,
+  onModelChange,
+  onRequestEditLastMessage,
+}: ChatInputProps): React.ReactElement {
   const [value, setValue] = useState('');
   const textareaRef = useRef<HTMLTextAreaElement>(null);
+  const selectedModel = useMemo(
+    () => models.find((model) => model.id === selectedModelId) ?? models[0],
+    [models, selectedModelId],
+  );
 
-  function handleSubmit(e: React.FormEvent): void {
-    e.preventDefault();
+  useEffect(() => {
+    const textarea = textareaRef.current;
+    if (!textarea) return;
+    textarea.style.height = 'auto';
+    textarea.style.height = `${Math.min(textarea.scrollHeight, MAX_HEIGHT)}px`;
+  }, [value]);
+
+  useEffect(() => {
+    function handleGlobalFocus(event: KeyboardEvent): void {
+      if (
+        (event.metaKey || event.ctrlKey) &&
+        (event.key === '/' || event.key.toLowerCase() === 'k')
+      ) {
+        const target = event.target as HTMLElement | null;
+        if (target?.closest('input, textarea, [contenteditable="true"]')) return;
+        event.preventDefault();
+        textareaRef.current?.focus();
+      }
+    }
+
+    document.addEventListener('keydown', handleGlobalFocus);
+    return () => document.removeEventListener('keydown', handleGlobalFocus);
+  }, []);
+
+  function handleSubmit(event: React.FormEvent): void {
+    event.preventDefault();
     const trimmed = value.trim();
-    if (!trimmed || disabled) return;
-    onSend(trimmed);
+    if (!trimmed || isStreaming) return;
+    onSend(trimmed, { modelId: selectedModel?.id });
     setValue('');
     textareaRef.current?.focus();
   }
 
-  function handleKeyDown(e: React.KeyboardEvent<HTMLTextAreaElement>): void {
-    if (e.key === 'Enter' && !e.shiftKey) {
-      e.preventDefault();
-      handleSubmit(e);
+  function handleKeyDown(event: React.KeyboardEvent<HTMLTextAreaElement>): void {
+    if (event.key === 'Enter' && (event.metaKey || event.ctrlKey)) {
+      event.preventDefault();
+      handleSubmit(event);
+      return;
+    }
+
+    if (event.key === 'ArrowUp' && value.length === 0 && onRequestEditLastMessage) {
+      const lastMessage = onRequestEditLastMessage();
+      if (lastMessage) {
+        event.preventDefault();
+        setValue(lastMessage);
+      }
     }
   }
 
+  const charCount = value.length;
+  const tokenEstimate = Math.ceil(charCount / 4);
+
   return (
-    <form onSubmit={handleSubmit} className="border-t border-surface-border bg-surface-card p-4">
-      <div className="flex items-end gap-3">
-        <textarea
-          ref={textareaRef}
-          value={value}
-          onChange={(e) => setValue(e.target.value)}
-          onKeyDown={handleKeyDown}
-          disabled={disabled}
-          rows={1}
-          placeholder="Type a message... (Enter to send, Shift+Enter for newline)"
-          className="max-h-32 min-h-[2.5rem] flex-1 resize-none rounded-lg border border-surface-border bg-surface-elevated px-3 py-2 text-sm text-text-primary placeholder:text-text-muted focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500 disabled:opacity-50"
-        />
-        <button
-          type="submit"
-          disabled={disabled || !value.trim()}
-          className="rounded-lg bg-blue-600 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-blue-700 disabled:opacity-50"
-        >
-          Send
-        </button>
+    <form
+      onSubmit={handleSubmit}
+      className="border-t px-4 py-4 backdrop-blur-xl md:px-6"
+      style={{
+        backgroundColor: 'color-mix(in srgb, var(--color-surface) 88%, transparent)',
+        borderColor: 'var(--color-border)',
+      }}
+    >
+      <div
+        className="rounded-[28px] border p-3 shadow-[var(--shadow-ms-lg)]"
+        style={{
+          backgroundColor: 'var(--color-surface-2)',
+          borderColor: 'var(--color-border)',
+        }}
+      >
+        <div className="mb-3 flex flex-wrap items-center gap-3">
+          <label className="flex min-w-0 items-center gap-2 text-xs text-[var(--color-muted)]">
+            <span className="uppercase tracking-[0.18em]">Model</span>
+            <select
+              value={selectedModelId}
+              onChange={(event) => onModelChange(event.target.value)}
+              className="rounded-full border px-3 py-1.5 text-sm outline-none"
+              style={{
+                backgroundColor: 'var(--color-surface)',
+                borderColor: 'var(--color-border)',
+                color: 'var(--color-text)',
+              }}
+            >
+              {models.map((model) => (
+                <option key={`${model.provider}:${model.id}`} value={model.id}>
+                  {model.name} · {model.provider}
+                </option>
+              ))}
+            </select>
+          </label>
+          <div className="ml-auto hidden items-center gap-2 text-xs text-[var(--color-muted)] md:flex">
+            <span className="rounded-full border border-[var(--color-border)] px-2 py-1">
+              ⌘/ focus
+            </span>
+            <span className="rounded-full border border-[var(--color-border)] px-2 py-1">
+              ⌘K focus
+            </span>
+            <span className="rounded-full border border-[var(--color-border)] px-2 py-1">
+              ⌘↵ send
+            </span>
+          </div>
+        </div>
+
+        <div className="flex items-end gap-3">
+          <textarea
+            ref={textareaRef}
+            value={value}
+            onChange={(event) => setValue(event.target.value)}
+            onKeyDown={handleKeyDown}
+            disabled={isStreaming}
+            rows={1}
+            placeholder="Ask Mosaic something..."
+            className="min-h-[3.25rem] flex-1 resize-none bg-transparent px-1 py-2 text-sm outline-none placeholder:text-[var(--color-muted)] disabled:opacity-60"
+            style={{
+              color: 'var(--color-text)',
+              maxHeight: `${MAX_HEIGHT}px`,
+            }}
+          />
+
+          {isStreaming ? (
+            <button
+              type="button"
+              onClick={onStop}
+              className="inline-flex h-11 items-center gap-2 rounded-full border px-4 text-sm font-medium transition-colors"
+              style={{
+                backgroundColor: 'var(--color-surface)',
+                borderColor: 'var(--color-border)',
+                color: 'var(--color-text)',
+              }}
+            >
+              <span className="inline-block h-2.5 w-2.5 rounded-sm bg-[var(--color-danger)]" />
+              Stop
+            </button>
+          ) : (
+            <button
+              type="submit"
+              disabled={!value.trim()}
+              className="inline-flex h-11 items-center gap-2 rounded-full px-4 text-sm font-semibold text-white transition-all disabled:cursor-not-allowed disabled:opacity-45"
+              style={{ backgroundColor: 'var(--color-ms-blue-500)' }}
+            >
+              <span>Send</span>
+              <span aria-hidden="true">↗</span>
+            </button>
+          )}
+        </div>
+
+        <div className="mt-3 flex flex-wrap items-center gap-2 text-xs text-[var(--color-muted)]">
+          <span>{charCount.toLocaleString()} chars</span>
+          <span>·</span>
+          <span>~{tokenEstimate.toLocaleString()} tokens</span>
+          {selectedModel ? (
+            <>
+              <span>·</span>
+              <span>{selectedModel.reasoning ? 'Reasoning on' : 'Fast response'}</span>
+            </>
+          ) : null}
+          <span className="ml-auto">Shift+Enter newline · Arrow ↑ edit last</span>
+        </div>
       </div>
     </form>
   );

apps/web/src/components/chat/conversation-list.tsx

@@ -7,6 +7,8 @@ import type { Conversation } from '@/lib/types';
 interface ConversationListProps {
   conversations: Conversation[];
   activeId: string | null;
+  isOpen: boolean;
+  onClose: () => void;
   onSelect: (id: string) => void;
   onNew: () => void;
   onRename: (id: string, title: string) => void;
@@ -20,7 +22,6 @@ interface ContextMenuState {
   y: number;
 }
 
-/** Format a date as relative time (e.g. "2h ago", "Yesterday"). */
 function formatRelativeTime(dateStr: string): string {
   const date = new Date(dateStr);
   const now = new Date();
@@ -40,6 +41,8 @@ function formatRelativeTime(dateStr: string): string {
 export function ConversationList({
   conversations,
   activeId,
+  isOpen,
+  onClose,
   onSelect,
   onNew,
   onRename,
@@ -54,24 +57,24 @@ export function ConversationList({
   const [showArchived, setShowArchived] = useState(false);
   const renameInputRef = useRef<HTMLInputElement>(null);
 
-  const activeConversations = conversations.filter((c) => !c.archived);
-  const archivedConversations = conversations.filter((c) => c.archived);
+  const activeConversations = conversations.filter((conversation) => !conversation.archived);
+  const archivedConversations = conversations.filter((conversation) => conversation.archived);
 
   const filteredActive = searchQuery
-    ? activeConversations.filter((c) =>
-        (c.title ?? 'Untitled').toLowerCase().includes(searchQuery.toLowerCase()),
+    ? activeConversations.filter((conversation) =>
+        (conversation.title ?? 'Untitled').toLowerCase().includes(searchQuery.toLowerCase()),
       )
     : activeConversations;
 
   const filteredArchived = searchQuery
-    ? archivedConversations.filter((c) =>
-        (c.title ?? 'Untitled').toLowerCase().includes(searchQuery.toLowerCase()),
+    ? archivedConversations.filter((conversation) =>
+        (conversation.title ?? 'Untitled').toLowerCase().includes(searchQuery.toLowerCase()),
       )
     : archivedConversations;
 
-  const handleContextMenu = useCallback((e: React.MouseEvent, conversationId: string) => {
-    e.preventDefault();
-    setContextMenu({ conversationId, x: e.clientX, y: e.clientY });
+  const handleContextMenu = useCallback((event: React.MouseEvent, conversationId: string) => {
+    event.preventDefault();
+    setContextMenu({ conversationId, x: event.clientX, y: event.clientY });
     setDeleteConfirmId(null);
   }, []);
 
@@ -97,7 +100,7 @@ export function ConversationList({
     }
     setRenamingId(null);
     setRenameValue('');
-  }, [renamingId, renameValue, onRename]);
+  }, [onRename, renameValue, renamingId]);
 
   const cancelRename = useCallback(() => {
     setRenamingId(null);
@@ -105,24 +108,20 @@ export function ConversationList({
   }, []);
 
   const handleRenameKeyDown = useCallback(
-    (e: React.KeyboardEvent<HTMLInputElement>) => {
-      if (e.key === 'Enter') commitRename();
-      if (e.key === 'Escape') cancelRename();
+    (event: React.KeyboardEvent<HTMLInputElement>) => {
+      if (event.key === 'Enter') commitRename();
+      if (event.key === 'Escape') cancelRename();
     },
-    [commitRename, cancelRename],
+    [cancelRename, commitRename],
   );
 
-  const handleDeleteClick = useCallback((id: string) => {
-    setDeleteConfirmId(id);
-  }, []);
-
   const confirmDelete = useCallback(
     (id: string) => {
       onDelete(id);
       setDeleteConfirmId(null);
       closeContextMenu();
     },
-    [onDelete, closeContextMenu],
+    [closeContextMenu, onDelete],
   );
 
   const handleArchiveToggle = useCallback(
@@ -130,47 +129,59 @@ export function ConversationList({
       onArchive(id, archived);
       closeContextMenu();
     },
-    [onArchive, closeContextMenu],
+    [closeContextMenu, onArchive],
   );
 
-  const contextConv = contextMenu
-    ? conversations.find((c) => c.id === contextMenu.conversationId)
+  const contextConversation = contextMenu
+    ? conversations.find((conversation) => conversation.id === contextMenu.conversationId)
     : null;
 
-  function renderConversationItem(conv: Conversation): React.ReactElement {
-    const isActive = activeId === conv.id;
-    const isRenaming = renamingId === conv.id;
+  function renderConversationItem(conversation: Conversation): React.ReactElement {
+    const isActive = activeId === conversation.id;
+    const isRenaming = renamingId === conversation.id;
 
     return (
-      <div key={conv.id} className="group relative">
+      <div key={conversation.id} className="group relative">
         {isRenaming ? (
           <div className="px-3 py-2">
             <input
               ref={renameInputRef}
               value={renameValue}
-              onChange={(e) => setRenameValue(e.target.value)}
+              onChange={(event) => setRenameValue(event.target.value)}
               onBlur={commitRename}
               onKeyDown={handleRenameKeyDown}
-              className="w-full rounded border border-blue-500 bg-surface-elevated px-2 py-0.5 text-sm text-text-primary outline-none"
+              className="w-full rounded-xl border px-3 py-2 text-sm outline-none"
+              style={{
+                borderColor: 'var(--color-ms-blue-500)',
+                backgroundColor: 'var(--color-surface-2)',
+                color: 'var(--color-text)',
+              }}
               maxLength={255}
             />
           </div>
         ) : (
           <button
             type="button"
-            onClick={() => onSelect(conv.id)}
-            onDoubleClick={() => startRename(conv.id, conv.title)}
-            onContextMenu={(e) => handleContextMenu(e, conv.id)}
+            onClick={() => {
+              onSelect(conversation.id);
+              if (window.innerWidth < 768) onClose();
+            }}
+            onDoubleClick={() => startRename(conversation.id, conversation.title)}
+            onContextMenu={(event) => handleContextMenu(event, conversation.id)}
             className={cn(
-              'w-full px-3 py-2 text-left text-sm transition-colors',
-              isActive
-                ? 'bg-blue-600/20 text-blue-400'
-                : 'text-text-secondary hover:bg-surface-elevated',
+              'w-full rounded-2xl px-3 py-2 text-left text-sm transition-colors',
+              isActive ? 'shadow-[var(--shadow-ms-sm)]' : 'hover:bg-white/5',
             )}
+            style={{
+              backgroundColor: isActive
+                ? 'color-mix(in srgb, var(--color-ms-blue-500) 22%, transparent)'
+                : 'transparent',
+              color: isActive ? 'var(--color-text)' : 'var(--color-text-2)',
+            }}
           >
-            <span className="block truncate">{conv.title ?? 'Untitled'}</span>
-            <span className="block text-xs text-text-muted">
-              {formatRelativeTime(conv.updatedAt)}
+            <span className="block truncate font-medium">{conversation.title ?? 'Untitled'}</span>
+            <span className="block text-xs text-[var(--color-muted)]">
+              {formatRelativeTime(conversation.updatedAt)}
             </span>
           </button>
         )}
@@ -180,127 +191,138 @@ export function ConversationList({
 
   return (
     <>
-      {/* Backdrop to close context menu */}
-      {contextMenu && (
-        <div className="fixed inset-0 z-10" onClick={closeContextMenu} aria-hidden="true" />
-      )}
+      {isOpen ? (
+        <button
+          type="button"
+          className="fixed inset-0 z-20 bg-black/45 md:hidden"
+          onClick={onClose}
+          aria-label="Close conversation sidebar"
+        />
+      ) : null}
 
-      <div className="flex h-full w-64 flex-col border-r border-surface-border bg-surface-card">
-        {/* Header */}
-        <div className="flex items-center justify-between p-3">
-          <h2 className="text-sm font-medium text-text-secondary">Conversations</h2>
+      {contextMenu ? (
+        <div className="fixed inset-0 z-10" onClick={closeContextMenu} aria-hidden="true" />
+      ) : null}
+
+      <div
+        className={cn(
+          'fixed inset-y-0 left-0 z-30 flex h-full w-[18.5rem] flex-col border-r px-3 py-3 transition-transform duration-200 md:static md:z-auto',
+          isOpen
+            ? 'translate-x-0'
+            : '-translate-x-full md:w-0 md:min-w-0 md:overflow-hidden md:border-r-0 md:px-0 md:py-0',
+        )}
+        style={{
+          backgroundColor: 'var(--color-surface)',
+          borderColor: 'var(--color-border)',
+        }}
+      >
+        <div className="flex items-center justify-between px-1 pb-3">
+          <h2 className="text-sm font-medium text-[var(--color-text-2)]">Conversations</h2>
           <button
             type="button"
             onClick={onNew}
-            className="rounded-md px-2 py-1 text-xs text-blue-400 transition-colors hover:bg-surface-elevated"
+            className="rounded-full px-3 py-1 text-xs transition-colors hover:bg-white/5"
+            style={{ color: 'var(--color-ms-blue-400)' }}
           >
             + New
           </button>
         </div>
 
-        {/* Search input */}
-        <div className="px-3 pb-2">
+        <div className="pb-3">
           <input
             type="search"
             value={searchQuery}
-            onChange={(e) => setSearchQuery(e.target.value)}
-            placeholder="Search conversations\u2026"
-            className="w-full rounded-md border border-surface-border bg-surface-elevated px-3 py-1.5 text-xs text-text-primary placeholder:text-text-muted focus:border-blue-500 focus:outline-none"
+            onChange={(event) => setSearchQuery(event.target.value)}
+            placeholder="Search conversations…"
+            className="w-full rounded-2xl border px-3 py-2 text-xs placeholder:text-[var(--color-muted)] focus:outline-none"
+            style={{
+              backgroundColor: 'var(--color-surface-2)',
+              borderColor: 'var(--color-border)',
+              color: 'var(--color-text)',
+            }}
           />
         </div>
 
-        {/* Conversation list */}
-        <div className="flex-1 overflow-y-auto">
-          {filteredActive.length === 0 && !searchQuery && (
-            <p className="px-3 py-2 text-xs text-text-muted">No conversations yet</p>
-          )}
-          {filteredActive.length === 0 && searchQuery && (
-            <p className="px-3 py-2 text-xs text-text-muted">
-              No results for &ldquo;{searchQuery}&rdquo;
+        <div className="flex-1 overflow-y-auto space-y-1">
+          {filteredActive.length === 0 && !searchQuery ? (
+            <p className="px-1 py-2 text-xs text-[var(--color-muted)]">No conversations yet</p>
+          ) : null}
+          {filteredActive.length === 0 && searchQuery ? (
+            <p className="px-1 py-2 text-xs text-[var(--color-muted)]">
+              No results for “{searchQuery}”
             </p>
-          )}
-          {filteredActive.map((conv) => renderConversationItem(conv))}
+          ) : null}
+          {filteredActive.map((conversation) => renderConversationItem(conversation))}
 
-          {/* Archived section */}
-          {archivedConversations.length > 0 && (
-            <div className="mt-2">
+          {archivedConversations.length > 0 ? (
+            <div className="pt-2">
               <button
                 type="button"
-                onClick={() => setShowArchived((v) => !v)}
-                className="flex w-full items-center gap-1 px-3 py-1 text-xs text-text-muted transition-colors hover:text-text-secondary"
+                onClick={() => setShowArchived((prev) => !prev)}
+                className="flex w-full items-center gap-2 px-1 py-1 text-xs text-[var(--color-muted)] transition-colors hover:text-[var(--color-text-2)]"
               >
                 <span
-                  className={cn(
-                    'inline-block transition-transform',
-                    showArchived ? 'rotate-90' : '',
-                  )}
+                  className={cn('inline-block transition-transform', showArchived && 'rotate-90')}
                 >
-                  &#9658;
+                  ▶
                 </span>
                 Archived ({archivedConversations.length})
               </button>
-              {showArchived && (
-                <div className="opacity-60">
-                  {filteredArchived.map((conv) => renderConversationItem(conv))}
+              {showArchived ? (
+                <div className="mt-1 space-y-1 opacity-70">
+                  {filteredArchived.map((conversation) => renderConversationItem(conversation))}
                 </div>
-              )}
+              ) : null}
             </div>
-          )}
+          ) : null}
         </div>
       </div>
 
-      {/* Context menu */}
-      {contextMenu && contextConv && (
+      {contextMenu && contextConversation ? (
         <div
-          className="fixed z-20 min-w-36 rounded-md border border-surface-border bg-surface-card py-1 shadow-lg"
-          style={{ top: contextMenu.y, left: contextMenu.x }}
+          className="fixed z-30 min-w-40 rounded-2xl border py-1 shadow-[var(--shadow-ms-lg)]"
+          style={{
+            top: contextMenu.y,
+            left: contextMenu.x,
+            backgroundColor: 'var(--color-surface)',
+            borderColor: 'var(--color-border)',
+          }}
         >
           <button
             type="button"
-            className="w-full px-3 py-1.5 text-left text-sm text-text-secondary hover:bg-surface-elevated"
-            onClick={() => startRename(contextConv.id, contextConv.title)}
+            className="w-full px-3 py-2 text-left text-sm text-[var(--color-text-2)] transition-colors hover:bg-white/5"
+            onClick={() => startRename(contextConversation.id, contextConversation.title)}
           >
             Rename
           </button>
           <button
             type="button"
-            className="w-full px-3 py-1.5 text-left text-sm text-text-secondary hover:bg-surface-elevated"
-            onClick={() => handleArchiveToggle(contextConv.id, !contextConv.archived)}
+            className="w-full px-3 py-2 text-left text-sm text-[var(--color-text-2)] transition-colors hover:bg-white/5"
+            onClick={() =>
+              handleArchiveToggle(contextConversation.id, !contextConversation.archived)
+            }
           >
-            {contextConv.archived ? 'Unarchive' : 'Archive'}
+            {contextConversation.archived ? 'Restore' : 'Archive'}
           </button>
-          <hr className="my-1 border-surface-border" />
-          {deleteConfirmId === contextConv.id ? (
-            <div className="px-3 py-1.5">
-              <p className="mb-1.5 text-xs text-red-400">Delete this conversation?</p>
-              <div className="flex gap-2">
-                <button
-                  type="button"
-                  className="rounded bg-red-600 px-2 py-0.5 text-xs text-white hover:bg-red-700"
-                  onClick={() => confirmDelete(contextConv.id)}
-                >
-                  Delete
-                </button>
-                <button
-                  type="button"
-                  className="rounded px-2 py-0.5 text-xs text-text-muted hover:bg-surface-elevated"
-                  onClick={() => setDeleteConfirmId(null)}
-                >
-                  Cancel
-                </button>
-              </div>
-            </div>
+          {deleteConfirmId === contextConversation.id ? (
+            <button
+              type="button"
+              className="w-full px-3 py-2 text-left text-sm text-[var(--color-danger)] transition-colors hover:bg-white/5"
+              onClick={() => confirmDelete(contextConversation.id)}
+            >
+              Confirm delete
+            </button>
           ) : (
             <button
               type="button"
-              className="w-full px-3 py-1.5 text-left text-sm text-red-400 hover:bg-surface-elevated"
-              onClick={() => handleDeleteClick(contextConv.id)}
+              className="w-full px-3 py-2 text-left text-sm text-[var(--color-danger)] transition-colors hover:bg-white/5"
+              onClick={() => setDeleteConfirmId(contextConversation.id)}
             >
-              Delete
+              Delete…
             </button>
           )}
         </div>
-      )}
+      ) : null}
     </>
   );
 }

apps/web/src/components/chat/message-bubble.tsx

@@ -1,5 +1,7 @@
 'use client';
 
+import { useCallback, useMemo, useState } from 'react';
+import ReactMarkdown from 'react-markdown';
 import { cn } from '@/lib/cn';
 import type { Message } from '@/lib/types';
 
@@ -9,27 +11,261 @@ interface MessageBubbleProps {
 
 export function MessageBubble({ message }: MessageBubbleProps): React.ReactElement {
   const isUser = message.role === 'user';
+  const isSystem = message.role === 'system';
+  const [copied, setCopied] = useState(false);
+  const [thinkingExpanded, setThinkingExpanded] = useState(false);
+  const { response, thinking } = useMemo(
+    () => parseThinking(message.content, message.thinking),
+    [message.content, message.thinking],
+  );
+
+  const handleCopy = useCallback(async (): Promise<void> => {
+    try {
+      await navigator.clipboard.writeText(response);
+      setCopied(true);
+      window.setTimeout(() => setCopied(false), 1800);
+    } catch (error) {
+      console.error('[MessageBubble] Failed to copy message:', error);
+    }
+  }, [response]);
+
+  if (isSystem) {
+    return (
+      <div className="flex justify-center">
+        <div
+          className="max-w-[42rem] rounded-full border px-3 py-1.5 text-xs backdrop-blur-sm"
+          style={{
+            borderColor: 'var(--color-border)',
+            backgroundColor: 'color-mix(in srgb, var(--color-surface) 70%, transparent)',
+            color: 'var(--color-muted)',
+          }}
+        >
+          <span>{response}</span>
+        </div>
+      </div>
+    );
+  }
 
   return (
-    <div className={cn('flex', isUser ? 'justify-end' : 'justify-start')}>
+    <div className={cn('group flex', isUser ? 'justify-end' : 'justify-start')}>
       <div
         className={cn(
-          'max-w-[75%] rounded-xl px-4 py-3 text-sm',
-          isUser
-            ? 'bg-blue-600 text-white'
-            : 'border border-surface-border bg-surface-elevated text-text-primary',
+          'flex max-w-[min(78ch,85%)] flex-col gap-2',
+          isUser ? 'items-end' : 'items-start',
         )}
       >
-        <div className="whitespace-pre-wrap break-words">{message.content}</div>
+        <div className={cn('flex items-center gap-2 text-[11px]', isUser && 'flex-row-reverse')}>
+          <span className="font-medium text-[var(--color-text-2)]">
+            {isUser ? 'You' : 'Assistant'}
+          </span>
+          {!isUser && message.model ? (
+            <span
+              className="rounded-full border px-2 py-0.5 font-medium text-[var(--color-text-2)]"
+              style={{
+                backgroundColor: 'color-mix(in srgb, var(--color-surface-2) 82%, transparent)',
+                borderColor: 'var(--color-border)',
+              }}
+              title={message.provider ? `Provider: ${message.provider}` : undefined}
+            >
+              {message.model}
+            </span>
+          ) : null}
+          {!isUser && typeof message.totalTokens === 'number' && message.totalTokens > 0 ? (
+            <span
+              className="rounded-full border px-2 py-0.5 text-[var(--color-muted)]"
+              style={{ borderColor: 'var(--color-border)' }}
+            >
+              {formatTokenCount(message.totalTokens)}
+            </span>
+          ) : null}
+          <span className="text-[var(--color-muted)]">{formatTimestamp(message.createdAt)}</span>
+        </div>
+
+        {thinking && !isUser ? (
+          <div
+            className="w-full overflow-hidden rounded-2xl border"
+            style={{
+              backgroundColor: 'color-mix(in srgb, var(--color-surface-2) 88%, transparent)',
+              borderColor: 'var(--color-border)',
+            }}
+          >
+            <button
+              type="button"
+              onClick={() => setThinkingExpanded((prev) => !prev)}
+              className="flex w-full items-center gap-2 px-3 py-2 text-left text-xs font-medium text-[var(--color-text-2)] transition-colors hover:bg-black/5"
+              aria-expanded={thinkingExpanded}
+            >
+              <span
+                className={cn(
+                  'inline-block text-[10px] transition-transform',
+                  thinkingExpanded && 'rotate-90',
+                )}
+              >
+                ▶
+              </span>
+              <span>Chain of thought</span>
+              <span className="ml-auto text-[var(--color-muted)]">
+                {thinkingExpanded ? 'Hide' : 'Show'}
+              </span>
+            </button>
+            {thinkingExpanded ? (
+              <pre
+                className="overflow-x-auto border-t px-3 py-3 font-mono text-xs leading-6 whitespace-pre-wrap"
+                style={{
+                  borderColor: 'var(--color-border)',
+                  backgroundColor: 'var(--color-bg-deep)',
+                  color: 'var(--color-text-2)',
+                }}
+              >
+                {thinking}
+              </pre>
+            ) : null}
+          </div>
+        ) : null}
+
         <div
-          className={cn('mt-1 text-right text-xs', isUser ? 'text-blue-200' : 'text-text-muted')}
+          className={cn(
+            'relative w-full rounded-3xl px-4 py-3 text-sm shadow-[var(--shadow-ms-sm)]',
+            !isUser && 'border',
+          )}
+          style={{
+            backgroundColor: isUser ? 'var(--color-ms-blue-500)' : 'var(--color-surface)',
+            color: isUser ? '#fff' : 'var(--color-text)',
+            borderColor: isUser ? 'transparent' : 'var(--color-border)',
+          }}
         >
-          {new Date(message.createdAt).toLocaleTimeString([], {
-            hour: '2-digit',
-            minute: '2-digit',
-          })}
+          <div className="max-w-none">
+            <ReactMarkdown
+              components={{
+                p: ({ children }) => <p className="mb-3 leading-7 last:mb-0">{children}</p>,
+                ul: ({ children }) => <ul className="mb-3 list-disc pl-5 last:mb-0">{children}</ul>,
+                ol: ({ children }) => (
+                  <ol className="mb-3 list-decimal pl-5 last:mb-0">{children}</ol>
+                ),
+                li: ({ children }) => <li className="mb-1">{children}</li>,
+                a: ({ href, children }) => (
+                  <a
+                    href={href}
+                    className="font-medium underline underline-offset-4"
+                    target="_blank"
+                    rel="noreferrer"
+                  >
+                    {children}
+                  </a>
+                ),
+                pre: ({ children }) => <div className="mb-3 last:mb-0">{children}</div>,
+                code: ({ className, children, ...props }) => {
+                  const language = className?.replace('language-', '');
+                  const content = String(children).replace(/\n$/, '');
+                  const isInline = !className;
+
+                  if (isInline) {
+                    return (
+                      <code
+                        className="rounded-md px-1.5 py-0.5 font-mono text-[0.9em]"
+                        style={{
+                          backgroundColor:
+                            'color-mix(in srgb, var(--color-bg-deep) 76%, transparent)',
+                        }}
+                        {...props}
+                      >
+                        {children}
+                      </code>
+                    );
+                  }
+
+                  return (
+                    <div
+                      className="overflow-hidden rounded-2xl border"
+                      style={{
+                        backgroundColor: 'var(--color-bg-deep)',
+                        borderColor: 'var(--color-border)',
+                      }}
+                    >
+                      <div
+                        className="border-b px-3 py-2 font-mono text-[11px] uppercase tracking-[0.18em] text-[var(--color-muted)]"
+                        style={{ borderColor: 'var(--color-border)' }}
+                      >
+                        {language || 'code'}
+                      </div>
+                      <pre className="overflow-x-auto p-3">
+                        <code
+                          className={cn('font-mono text-[13px] leading-6', className)}
+                          {...props}
+                        >
+                          {content}
+                        </code>
+                      </pre>
+                    </div>
+                  );
+                },
+                blockquote: ({ children }) => (
+                  <blockquote
+                    className="mb-3 border-l-2 pl-4 italic last:mb-0"
+                    style={{ borderColor: 'var(--color-ms-blue-500)' }}
+                  >
+                    {children}
+                  </blockquote>
+                ),
+              }}
+            >
+              {response}
+            </ReactMarkdown>
+          </div>
+
+          <button
+            type="button"
+            onClick={() => void handleCopy()}
+            className="absolute -right-2 -top-2 rounded-full border p-2 opacity-0 shadow-[var(--shadow-ms-md)] transition-all group-hover:opacity-100 focus:opacity-100"
+            style={{
+              backgroundColor: 'var(--color-surface)',
+              borderColor: 'var(--color-border)',
+              color: copied ? 'var(--color-success)' : 'var(--color-text-2)',
+            }}
+            aria-label={copied ? 'Copied' : 'Copy message'}
+            title={copied ? 'Copied' : 'Copy message'}
+          >
+            {copied ? '✓' : '⧉'}
+          </button>
         </div>
       </div>
     </div>
   );
 }
+
+function parseThinking(
+  content: string,
+  thinking?: string,
+): { response: string; thinking: string | null } {
+  if (thinking) {
+    return { response: content, thinking };
+  }
+
+  const regex = /<(?:thinking|think)>([\s\S]*?)<\/(?:thinking|think)>/gi;
+  const matches = [...content.matchAll(regex)];
+  if (matches.length === 0) {
+    return { response: content, thinking: null };
+  }
+
+  return {
+    response: content.replace(regex, '').trim(),
+    thinking:
+      matches
+        .map((match) => match[1]?.trim() ?? '')
+        .filter(Boolean)
+        .join('\n\n') || null,
+  };
+}
+
+function formatTimestamp(createdAt: string): string {
+  return new Date(createdAt).toLocaleTimeString([], {
+    hour: '2-digit',
+    minute: '2-digit',
+  });
+}
+
+function formatTokenCount(totalTokens: number): string {
+  if (totalTokens >= 1_000_000) return `${(totalTokens / 1_000_000).toFixed(1)}M tokens`;
+  if (totalTokens >= 1_000) return `${(totalTokens / 1_000).toFixed(1)}k tokens`;
+  return `${totalTokens} tokens`;
+}

apps/web/src/components/chat/streaming-message.tsx

@@ -1,26 +1,97 @@
 'use client';
 
-/** Renders an in-progress assistant message from streaming text. */
+import { useEffect, useMemo, useState } from 'react';
+
 interface StreamingMessageProps {
   text: string;
+  modelName?: string | null;
+  thinking?: string;
 }
 
-export function StreamingMessage({ text }: StreamingMessageProps): React.ReactElement {
+const WAITING_QUIPS = [
+  'The AI is warming up... give it a moment.',
+  'Brewing some thoughts...',
+  'Summoning intelligence from the void...',
+  'Consulting the silicon oracle...',
+  'Teaching electrons to think...',
+];
+
+const TIMEOUT_QUIPS = [
+  'The model wandered off. Let’s try to find it again.',
+  'Response is taking the scenic route.',
+  'That answer is clearly overthinking things.',
+  'Still working. Either brilliance or a detour.',
+];
+
+export function StreamingMessage({
+  text,
+  modelName,
+  thinking,
+}: StreamingMessageProps): React.ReactElement {
+  const [elapsedMs, setElapsedMs] = useState(0);
+
+  useEffect(() => {
+    setElapsedMs(0);
+    const startedAt = Date.now();
+    const timer = window.setInterval(() => {
+      setElapsedMs(Date.now() - startedAt);
+    }, 1000);
+    return () => window.clearInterval(timer);
+  }, [text, modelName, thinking]);
+
+  const quip = useMemo(() => {
+    if (elapsedMs >= 18_000) {
+      return TIMEOUT_QUIPS[Math.floor((elapsedMs / 1000) % TIMEOUT_QUIPS.length)];
+    }
+    if (elapsedMs >= 4_000) {
+      return WAITING_QUIPS[Math.floor((elapsedMs / 1000) % WAITING_QUIPS.length)];
+    }
+    return null;
+  }, [elapsedMs]);
+
   return (
     <div className="flex justify-start">
-      <div className="max-w-[75%] rounded-xl border border-surface-border bg-surface-elevated px-4 py-3 text-sm text-text-primary">
+      <div
+        className="max-w-[min(78ch,85%)] rounded-3xl border px-4 py-3 text-sm shadow-[var(--shadow-ms-sm)]"
+        style={{
+          backgroundColor: 'var(--color-surface)',
+          borderColor: 'var(--color-border)',
+          color: 'var(--color-text)',
+        }}
+      >
+        <div className="mb-2 flex items-center gap-2 text-[11px]">
+          <span className="font-medium text-[var(--color-text-2)]">Assistant</span>
+          {modelName ? (
+            <span className="rounded-full border border-[var(--color-border)] px-2 py-0.5 text-[var(--color-text-2)]">
+              {modelName}
+            </span>
+          ) : null}
+          <span className="text-[var(--color-muted)]">{text ? 'Responding…' : 'Thinking…'}</span>
+        </div>
         {text ? (
           <div className="whitespace-pre-wrap break-words">{text}</div>
         ) : (
-          <div className="flex items-center gap-2 text-text-muted">
-            <span className="inline-block h-2 w-2 animate-pulse rounded-full bg-blue-500" />
-            <span className="inline-block h-2 w-2 animate-pulse rounded-full bg-blue-500 [animation-delay:0.2s]" />
-            <span className="inline-block h-2 w-2 animate-pulse rounded-full bg-blue-500 [animation-delay:0.4s]" />
+          <div className="flex items-center gap-2 text-[var(--color-muted)]">
+            <span className="inline-block h-2 w-2 animate-pulse rounded-full bg-[var(--color-ms-blue-500)]" />
+            <span className="inline-block h-2 w-2 animate-pulse rounded-full bg-[var(--color-ms-blue-500)] [animation-delay:0.2s]" />
+            <span className="inline-block h-2 w-2 animate-pulse rounded-full bg-[var(--color-ms-blue-500)] [animation-delay:0.4s]" />
           </div>
         )}
-        <div className="mt-1 flex items-center gap-1 text-xs text-text-muted">
-          <span className="inline-block h-1.5 w-1.5 animate-pulse rounded-full bg-blue-500" />
-          {text ? 'Responding...' : 'Thinking...'}
+        {thinking ? (
+          <div
+            className="mt-3 rounded-2xl border px-3 py-2 font-mono text-xs whitespace-pre-wrap"
+            style={{
+              backgroundColor: 'var(--color-bg-deep)',
+              borderColor: 'var(--color-border)',
+              color: 'var(--color-text-2)',
+            }}
+          >
+            {thinking}
+          </div>
+        ) : null}
+        <div className="mt-2 flex items-center gap-2 text-xs text-[var(--color-muted)]">
+          <span className="inline-block h-1.5 w-1.5 animate-pulse rounded-full bg-[var(--color-ms-blue-500)]" />
+          <span>{quip ?? (text ? 'Responding…' : 'Thinking…')}</span>
         </div>
       </div>
     </div>

apps/web/src/components/layout/app-header.tsx

@@ -0,0 +1,239 @@
+'use client';
+
+import Link from 'next/link';
+import { useCallback, useEffect, useMemo, useState } from 'react';
+import { signOut, useSession } from '@/lib/auth-client';
+
+interface AppHeaderProps {
+  conversationTitle?: string | null;
+  isSidebarOpen: boolean;
+  onToggleSidebar: () => void;
+}
+
+type ThemeMode = 'dark' | 'light';
+
+const THEME_STORAGE_KEY = 'mosaic-chat-theme';
+
+export function AppHeader({
+  conversationTitle,
+  isSidebarOpen,
+  onToggleSidebar,
+}: AppHeaderProps): React.ReactElement {
+  const { data: session } = useSession();
+  const [currentTime, setCurrentTime] = useState('');
+  const [version, setVersion] = useState<string | null>(null);
+  const [menuOpen, setMenuOpen] = useState(false);
+  const [theme, setTheme] = useState<ThemeMode>('dark');
+
+  useEffect(() => {
+    function updateTime(): void {
+      setCurrentTime(
+        new Date().toLocaleTimeString([], {
+          hour: '2-digit',
+          minute: '2-digit',
+        }),
+      );
+    }
+
+    updateTime();
+    const interval = window.setInterval(updateTime, 60_000);
+    return () => window.clearInterval(interval);
+  }, []);
+
+  useEffect(() => {
+    fetch('/version.json')
+      .then(async (res) => res.json() as Promise<{ version?: string; commit?: string }>)
+      .then((data) => {
+        if (data.version) {
+          setVersion(data.commit ? `${data.version}+${data.commit}` : data.version);
+        }
+      })
+      .catch(() => setVersion(null));
+  }, []);
+
+  useEffect(() => {
+    const storedTheme = window.localStorage.getItem(THEME_STORAGE_KEY);
+    const nextTheme = storedTheme === 'light' ? 'light' : 'dark';
+    applyTheme(nextTheme);
+    setTheme(nextTheme);
+  }, []);
+
+  const handleThemeToggle = useCallback(() => {
+    const nextTheme = theme === 'dark' ? 'light' : 'dark';
+    applyTheme(nextTheme);
+    window.localStorage.setItem(THEME_STORAGE_KEY, nextTheme);
+    setTheme(nextTheme);
+  }, [theme]);
+
+  const handleSignOut = useCallback(async (): Promise<void> => {
+    await signOut();
+    window.location.href = '/login';
+  }, []);
+
+  const userLabel = session?.user.name ?? session?.user.email ?? 'Mosaic User';
+  const initials = useMemo(() => getInitials(userLabel), [userLabel]);
+
+  return (
+    <header
+      className="sticky top-0 z-20 border-b backdrop-blur-xl"
+      style={{
+        backgroundColor: 'color-mix(in srgb, var(--color-surface) 82%, transparent)',
+        borderColor: 'var(--color-border)',
+      }}
+    >
+      <div className="flex items-center justify-between gap-3 px-4 py-3 md:px-6">
+        <div className="flex min-w-0 items-center gap-3">
+          <button
+            type="button"
+            onClick={onToggleSidebar}
+            className="inline-flex h-10 w-10 items-center justify-center rounded-2xl border transition-colors hover:bg-white/5"
+            style={{ borderColor: 'var(--color-border)', color: 'var(--color-text)' }}
+            aria-label="Toggle conversation sidebar"
+            aria-expanded={isSidebarOpen}
+          >
+            ☰
+          </button>
+
+          <Link href="/chat" className="flex min-w-0 items-center gap-3">
+            <div
+              className="flex h-10 w-10 items-center justify-center rounded-2xl text-sm font-semibold text-white shadow-[var(--shadow-ms-md)]"
+              style={{
+                background:
+                  'linear-gradient(135deg, var(--color-ms-blue-500), var(--color-ms-teal-500))',
+              }}
+            >
+              M
+            </div>
+            <div className="flex min-w-0 items-center gap-3">
+              <div className="text-sm font-semibold text-[var(--color-text)]">Mosaic</div>
+              <div className="hidden h-5 w-px bg-[var(--color-border)] md:block" />
+              <div className="hidden items-center gap-2 md:flex">
+                <span className="relative flex h-2.5 w-2.5">
+                  <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-[var(--color-ms-teal-500)] opacity-60" />
+                  <span className="relative inline-flex h-2.5 w-2.5 rounded-full bg-[var(--color-ms-teal-500)]" />
+                </span>
+                <span className="text-xs uppercase tracking-[0.18em] text-[var(--color-muted)]">
+                  Online
+                </span>
+              </div>
+            </div>
+          </Link>
+        </div>
+
+        <div className="hidden min-w-0 items-center gap-3 md:flex">
+          <div className="rounded-full border border-[var(--color-border)] px-3 py-1.5 text-xs text-[var(--color-text-2)]">
+            {currentTime || '--:--'}
+          </div>
+          <div className="max-w-[24rem] truncate text-sm font-medium text-[var(--color-text)]">
+            {conversationTitle?.trim() || 'New Session'}
+          </div>
+          {version ? (
+            <div className="rounded-full border border-[var(--color-border)] px-3 py-1.5 text-xs text-[var(--color-muted)]">
+              v{version}
+            </div>
+          ) : null}
+        </div>
+
+        <div className="flex items-center gap-2">
+          <div className="hidden items-center gap-2 lg:flex">
+            <ShortcutHint label="⌘/" text="focus" />
+            <ShortcutHint label="⌘K" text="focus" />
+          </div>
+
+          <button
+            type="button"
+            onClick={handleThemeToggle}
+            className="inline-flex h-10 items-center justify-center rounded-2xl border px-3 text-sm transition-colors hover:bg-white/5"
+            style={{ borderColor: 'var(--color-border)', color: 'var(--color-text)' }}
+            aria-label="Toggle theme"
+          >
+            {theme === 'dark' ? '☀︎' : '☾'}
+          </button>
+
+          <div className="relative">
+            <button
+              type="button"
+              onClick={() => setMenuOpen((prev) => !prev)}
+              className="inline-flex h-10 w-10 items-center justify-center rounded-full border text-sm font-semibold transition-colors hover:bg-white/5"
+              style={{
+                backgroundColor: 'var(--color-surface-2)',
+                borderColor: 'var(--color-border)',
+                color: 'var(--color-text)',
+              }}
+              aria-expanded={menuOpen}
+              aria-label="Open user menu"
+            >
+              {session?.user.image ? (
+                <img
+                  src={session.user.image}
+                  alt={userLabel}
+                  className="h-full w-full rounded-full object-cover"
+                />
+              ) : (
+                initials
+              )}
+            </button>
+            {menuOpen ? (
+              <div
+                className="absolute right-0 top-12 min-w-56 rounded-3xl border p-2 shadow-[var(--shadow-ms-lg)]"
+                style={{
+                  backgroundColor: 'var(--color-surface)',
+                  borderColor: 'var(--color-border)',
+                }}
+              >
+                <div className="border-b px-3 py-2" style={{ borderColor: 'var(--color-border)' }}>
+                  <div className="text-sm font-medium text-[var(--color-text)]">{userLabel}</div>
+                  {session?.user.email ? (
+                    <div className="text-xs text-[var(--color-muted)]">{session.user.email}</div>
+                  ) : null}
+                </div>
+                <div className="p-1">
+                  <Link
+                    href="/settings"
+                    className="flex rounded-2xl px-3 py-2 text-sm text-[var(--color-text-2)] transition-colors hover:bg-white/5"
+                    onClick={() => setMenuOpen(false)}
+                  >
+                    Settings
+                  </Link>
+                  <button
+                    type="button"
+                    onClick={() => void handleSignOut()}
+                    className="flex w-full rounded-2xl px-3 py-2 text-left text-sm text-[var(--color-text-2)] transition-colors hover:bg-white/5"
+                  >
+                    Sign out
+                  </button>
+                </div>
+              </div>
+            ) : null}
+          </div>
+        </div>
+      </div>
+    </header>
+  );
+}
+
+function ShortcutHint({ label, text }: { label: string; text: string }): React.ReactElement {
+  return (
+    <span className="inline-flex items-center gap-2 rounded-full border border-[var(--color-border)] px-3 py-1.5 text-xs text-[var(--color-muted)]">
+      <span className="font-medium text-[var(--color-text-2)]">{label}</span>
+      <span>{text}</span>
+    </span>
+  );
+}
+
+function getInitials(label: string): string {
+  const words = label.split(/\s+/).filter(Boolean).slice(0, 2);
+  if (words.length === 0) return 'M';
+  return words.map((word) => word.charAt(0).toUpperCase()).join('');
+}
+
+function applyTheme(theme: ThemeMode): void {
+  const root = document.documentElement;
+  if (theme === 'light') {
+    root.setAttribute('data-theme', 'light');
+    root.classList.remove('dark');
+  } else {
+    root.removeAttribute('data-theme');
+    root.classList.add('dark');
+  }
+}

apps/web/src/components/layout/topbar.tsx

@@ -1,11 +1,16 @@
 'use client';
 
-import { useRouter } from 'next/navigation';
+import { usePathname, useRouter } from 'next/navigation';
 import { useSession, signOut } from '@/lib/auth-client';
 
 export function Topbar(): React.ReactElement {
   const { data: session } = useSession();
   const router = useRouter();
+  const pathname = usePathname();
+
+  if (pathname.startsWith('/chat')) {
+    return <></>;
+  }
 
   async function handleSignOut(): Promise<void> {
     await signOut();

apps/web/src/lib/types.ts

@@ -15,10 +15,41 @@ export interface Message {
   conversationId: string;
   role: 'user' | 'assistant' | 'system';
   content: string;
+  thinking?: string;
+  model?: string;
+  provider?: string;
+  promptTokens?: number;
+  completionTokens?: number;
+  totalTokens?: number;
   metadata?: Record<string, unknown>;
   createdAt: string;
 }
 
+/** Model definition returned by provider APIs. */
+export interface ModelInfo {
+  id: string;
+  provider: string;
+  name: string;
+  reasoning: boolean;
+  contextWindow: number;
+  maxTokens: number;
+  inputTypes: Array<'text' | 'image'>;
+  cost: {
+    input: number;
+    output: number;
+    cacheRead: number;
+    cacheWrite: number;
+  };
+}
+
+/** Provider with associated models. */
+export interface ProviderInfo {
+  id: string;
+  name: string;
+  available: boolean;
+  models: ModelInfo[];
+}
+
 /** Task statuses. */
 export type TaskStatus = 'not-started' | 'in-progress' | 'blocked' | 'done' | 'cancelled';