feat(cli): TUI complete overhaul — components, sidebar, search, branding (#157)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/cli/src/tui/components/input-bar.tsx

@@ -0,0 +1,50 @@
+import React, { useState, useCallback } from 'react';
+import { Box, Text } from 'ink';
+import TextInput from 'ink-text-input';
+
+export interface InputBarProps {
+  onSubmit: (value: string) => void;
+  isStreaming: boolean;
+  connected: boolean;
+  placeholder?: string;
+}
+
+export function InputBar({
+  onSubmit,
+  isStreaming,
+  connected,
+  placeholder: placeholderOverride,
+}: InputBarProps) {
+  const [input, setInput] = useState('');
+
+  const handleSubmit = useCallback(
+    (value: string) => {
+      if (!value.trim() || isStreaming || !connected) return;
+      onSubmit(value);
+      setInput('');
+    },
+    [onSubmit, isStreaming, connected],
+  );
+
+  const placeholder =
+    placeholderOverride ??
+    (!connected
+      ? 'disconnected — waiting for gateway…'
+      : isStreaming
+        ? 'waiting for response…'
+        : 'message mosaic…');
+
+  return (
+    <Box paddingX={1} borderStyle="single" borderColor="gray">
+      <Text bold color="green">
+        {'❯ '}
+      </Text>
+      <TextInput
+        value={input}
+        onChange={setInput}
+        onSubmit={handleSubmit}
+        placeholder={placeholder}
+      />
+    </Box>
+  );
+}