apps/web/src/app/(authenticated)/knowledge/page.tsx

@@ -2,23 +2,25 @@
 
 import type { ReactElement } from "react";
 
-import { useState, useMemo } from "react";
+import { useState, useEffect, useCallback } from "react";
+import type { KnowledgeEntryWithTags, KnowledgeTag } from "@mosaic/shared";
 import type { EntryStatus } from "@mosaic/shared";
 import { EntryList } from "@/components/knowledge/EntryList";
 import { EntryFilters } from "@/components/knowledge/EntryFilters";
 import { ImportExportActions } from "@/components/knowledge";
-import { mockEntries, mockTags } from "@/lib/api/knowledge";
+import { fetchEntries, fetchTags } from "@/lib/api/knowledge";
+import type { EntriesResponse } from "@/lib/api/knowledge";
+import { MosaicSpinner } from "@/components/ui/MosaicSpinner";
 import Link from "next/link";
 import { Plus } from "lucide-react";
 
 export default function KnowledgePage(): ReactElement {
-  // TODO: Replace with real API call when backend is ready
+  // Data state
-  // const { data: entries, isLoading } = useQuery({
+  const [entries, setEntries] = useState<KnowledgeEntryWithTags[]>([]);
-  //   queryKey: ["knowledge-entries"],
+  const [tags, setTags] = useState<KnowledgeTag[]>([]);
-  //   queryFn: fetchEntries,
+  const [totalEntries, setTotalEntries] = useState(0);
-  // });
+  const [isLoading, setIsLoading] = useState(true);
-
+  const [error, setError] = useState<string | null>(null);
-  const [isLoading] = useState(false);
 
   // Filter and sort state
   const [selectedStatus, setSelectedStatus] = useState<EntryStatus | "all">("all");
@@ -31,60 +33,65 @@ export default function KnowledgePage(): ReactElement {
   const [currentPage, setCurrentPage] = useState(1);
   const itemsPerPage = 10;
 
-  // Client-side filtering and sorting
+  // Load tags on mount
-  const filteredAndSortedEntries = useMemo(() => {
+  useEffect(() => {
-    let filtered = [...mockEntries];
+    let cancelled = false;
 
-    // Filter by status
+    fetchTags()
-    if (selectedStatus !== "all") {
+      .then((result) => {
-      filtered = filtered.filter((entry) => entry.status === selectedStatus);
+        if (!cancelled) {
-    }
+          setTags(result);
+        }
+      })
+      .catch((err: unknown) => {
+        console.error("Failed to load tags:", err);
+      });
 
-    // Filter by tag
+    return (): void => {
-    if (selectedTag !== "all") {
+      cancelled = true;
-      filtered = filtered.filter((entry) =>
+    };
-        entry.tags.some((tag: { slug: string }) => tag.slug === selectedTag)
+  }, []);
-      );
-    }
 
-    // Filter by search query
+  // Load entries when filters/sort/page change
-    if (searchQuery.trim()) {
+  const loadEntries = useCallback(async (): Promise<void> => {
-      const query = searchQuery.toLowerCase();
+    setIsLoading(true);
-      filtered = filtered.filter(
+    setError(null);
-        (entry) =>
-          entry.title.toLowerCase().includes(query) ||
-          (entry.summary?.toLowerCase().includes(query) ?? false) ||
-          entry.tags.some((tag: { name: string }): boolean =>
-            tag.name.toLowerCase().includes(query)
-          )
-      );
-    }
 
-    // Sort entries
+    try {
-    filtered.sort((a, b) => {
+      const filters: Record<string, unknown> = {
-      let comparison = 0;
+        page: currentPage,
+        limit: itemsPerPage,
+        sortBy,
+        sortOrder,
+      };
 
-      if (sortBy === "title") {
+      if (selectedStatus !== "all") {
-        comparison = a.title.localeCompare(b.title);
+        filters.status = selectedStatus;
-      } else if (sortBy === "createdAt") {
+      }
-        comparison = new Date(a.createdAt).getTime() - new Date(b.createdAt).getTime();
+      if (selectedTag !== "all") {
-      } else {
+        filters.tag = selectedTag;
-        // updatedAt
+      }
-        comparison = new Date(a.updatedAt).getTime() - new Date(b.updatedAt).getTime();
+      if (searchQuery.trim()) {
+        filters.search = searchQuery.trim();
       }
 
-      return sortOrder === "asc" ? comparison : -comparison;
+      const response: EntriesResponse = await fetchEntries(
-    });
+        filters as Parameters<typeof fetchEntries>[0]
+      );
+      setEntries(response.data);
+      setTotalEntries(response.meta?.total ?? response.data.length);
+    } catch (err: unknown) {
+      setError(err instanceof Error ? err.message : "Failed to load entries");
+    } finally {
+      setIsLoading(false);
+    }
+  }, [currentPage, itemsPerPage, sortBy, sortOrder, selectedStatus, selectedTag, searchQuery]);
 
-    return filtered;
+  useEffect(() => {
-  }, [selectedStatus, selectedTag, searchQuery, sortBy, sortOrder]);
+    void loadEntries();
+  }, [loadEntries]);
 
-  // Pagination
+  const totalPages = Math.max(1, Math.ceil(totalEntries / itemsPerPage));
-  const totalPages = Math.ceil(filteredAndSortedEntries.length / itemsPerPage);
-  const paginatedEntries = filteredAndSortedEntries.slice(
-    (currentPage - 1) * itemsPerPage,
-    currentPage * itemsPerPage
-  );
 
   // Reset to page 1 when filters change
   const handleFilterChange = (callback: () => void): void => {
@@ -101,6 +108,16 @@ export default function KnowledgePage(): ReactElement {
     setCurrentPage(1);
   };
 
+  if (isLoading && entries.length === 0) {
+    return (
+      <main className="container mx-auto px-4 py-8 max-w-5xl">
+        <div className="flex justify-center items-center py-20">
+          <MosaicSpinner size={48} label="Loading knowledge base..." />
+        </div>
+      </main>
+    );
+  }
+
   return (
     <main className="container mx-auto px-4 py-8 max-w-5xl">
       {/* Header */}
@@ -125,14 +142,37 @@ export default function KnowledgePage(): ReactElement {
         <div className="flex justify-end">
           <ImportExportActions
             onImportComplete={() => {
-              // TODO: Refresh the entry list when real API is connected
+              void loadEntries();
-              // For now, this would trigger a refetch of the entries
-              window.location.reload();
             }}
           />
         </div>
       </div>
 
+      {/* Error state */}
+      {error && (
+        <div
+          className="mb-6 p-4 rounded-lg border"
+          style={{
+            borderColor: "var(--danger)",
+            background: "rgba(229,72,77,0.08)",
+          }}
+        >
+          <p className="text-sm" style={{ color: "var(--danger)" }}>
+            {error}
+          </p>
+          <button
+            type="button"
+            onClick={() => {
+              void loadEntries();
+            }}
+            className="mt-2 text-sm font-medium underline"
+            style={{ color: "var(--danger)" }}
+          >
+            Retry
+          </button>
+        </div>
+      )}
+
       {/* Filters */}
       <EntryFilters
         selectedStatus={selectedStatus}
@@ -140,7 +180,7 @@ export default function KnowledgePage(): ReactElement {
         searchQuery={searchQuery}
         sortBy={sortBy}
         sortOrder={sortOrder}
-        tags={mockTags}
+        tags={tags}
         onStatusChange={(status) => {
           handleFilterChange(() => {
             setSelectedStatus(status);
@@ -161,7 +201,7 @@ export default function KnowledgePage(): ReactElement {
 
       {/* Entry list */}
       <EntryList
-        entries={paginatedEntries}
+        entries={entries}
         isLoading={isLoading}
         currentPage={currentPage}
         totalPages={totalPages}

apps/web/src/components/knowledge/EntryList.tsx

@@ -1,6 +1,7 @@
 import type { KnowledgeEntryWithTags } from "@mosaic/shared";
 import { EntryCard } from "./EntryCard";
 import { BookOpen } from "lucide-react";
+import { MosaicSpinner } from "@/components/ui/MosaicSpinner";
 
 interface EntryListProps {
   entries: KnowledgeEntryWithTags[];
@@ -20,18 +21,22 @@ export function EntryList({
   if (isLoading) {
     return (
       <div className="flex justify-center items-center p-12">
-        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600"></div>
+        <MosaicSpinner size={36} label="Loading entries..." />
-        <span className="ml-3 text-gray-600">Loading entries...</span>
       </div>
     );
   }
 
   if (entries.length === 0) {
     return (
-      <div className="text-center p-12 bg-white rounded-lg shadow-sm border border-gray-200">
+      <div
-        <BookOpen className="w-12 h-12 text-gray-400 mx-auto mb-3" />
+        className="text-center p-12 rounded-lg border"
-        <p className="text-lg text-gray-700 font-medium">No entries found</p>
+        style={{ background: "var(--surface)", borderColor: "var(--border)" }}
-        <p className="text-sm text-gray-500 mt-2">
+      >
+        <BookOpen className="w-12 h-12 mx-auto mb-3" style={{ color: "var(--text-muted)" }} />
+        <p className="text-lg font-medium" style={{ color: "var(--text-muted)" }}>
+          No entries found
+        </p>
+        <p className="text-sm mt-2" style={{ color: "var(--text-muted)" }}>
           Try adjusting your filters or create a new entry
         </p>
       </div>

apps/web/src/components/knowledge/KnowledgeGraphViewer.tsx

@@ -16,6 +16,7 @@ import {
 } from "@xyflow/react";
 import "@xyflow/react/dist/style.css";
 import { fetchKnowledgeGraph } from "@/lib/api/knowledge";
+import { MosaicSpinner } from "@/components/ui/MosaicSpinner";
 import ELK from "elkjs/lib/elk.bundled.js";
 
 // PDA-friendly status colors from CLAUDE.md
@@ -376,10 +377,7 @@ export function KnowledgeGraphViewer({
   if (isLoading) {
     return (
       <div className="flex items-center justify-center h-screen">
-        <div
+        <MosaicSpinner size={48} label="Loading knowledge graph..." />
-          data-testid="loading-spinner"
-          className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-500"
-        />
       </div>
     );
   }
@@ -387,11 +385,14 @@ export function KnowledgeGraphViewer({
   if (error || !graphData) {
     return (
       <div className="flex flex-col items-center justify-center h-screen p-8">
-        <div className="text-red-500 text-xl font-semibold mb-2">Error Loading Graph</div>
+        <div className="text-xl font-semibold mb-2" style={{ color: "var(--danger)" }}>
+          Error Loading Graph
+        </div>
         <div className="text-sm text-gray-500 dark:text-gray-400">{error}</div>
         <button
           onClick={loadGraph}
-          className="mt-4 px-4 py-2 bg-blue-500 text-white rounded hover:bg-blue-600"
+          className="mt-4 px-4 py-2 rounded text-white"
+          style={{ background: "var(--danger)" }}
         >
           Retry
         </button>

apps/web/src/components/knowledge/StatsDashboard.tsx

@@ -2,6 +2,7 @@
 
 import { useEffect, useState } from "react";
 import { fetchKnowledgeStats } from "@/lib/api/knowledge";
+import { MosaicSpinner } from "@/components/ui/MosaicSpinner";
 import Link from "next/link";
 
 interface KnowledgeStats {
@@ -61,13 +62,20 @@ export function StatsDashboard(): React.JSX.Element {
   if (isLoading) {
     return (
       <div className="flex items-center justify-center p-12">
-        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-500" />
+        <MosaicSpinner size={36} label="Loading statistics..." />
       </div>
     );
   }
 
   if (error || !stats) {
-    return <div className="p-8 text-center text-red-500">Error loading statistics: {error}</div>;
+    return (
+      <div className="p-8 text-center">
+        <p className="font-medium mb-2" style={{ color: "var(--danger)" }}>
+          Error loading statistics
+        </p>
+        <p className="text-sm text-gray-500 dark:text-gray-400">{error}</p>
+      </div>
+    );
   }
 
   const { overview, mostConnected, recentActivity, tagDistribution } = stats;

apps/web/src/lib/api/knowledge.ts

@@ -8,8 +8,9 @@ import type {
   KnowledgeTag,
   KnowledgeEntryVersionWithAuthor,
   PaginatedResponse,
+  EntryStatus,
+  Visibility,
 } from "@mosaic/shared";
-import { EntryStatus, Visibility } from "@mosaic/shared";
 import { apiGet, apiPost, apiPatch, apiDelete, type ApiResponse } from "./client";
 
 export interface EntryFilters {
@@ -370,241 +371,3 @@ export async function fetchKnowledgeGraph(filters?: {
   const endpoint = queryString ? `/api/knowledge/graph?${queryString}` : "/api/knowledge/graph";
   return apiGet(endpoint);
 }
-
-/**
- * Mock entries for development (until backend endpoints are ready)
- */
-export const mockEntries: KnowledgeEntryWithTags[] = [
-  {
-    id: "entry-1",
-    workspaceId: "workspace-1",
-    slug: "getting-started",
-    title: "Getting Started with Mosaic Stack",
-    content: "# Getting Started\n\nWelcome to Mosaic Stack...",
-    contentHtml: "<h1>Getting Started</h1><p>Welcome to Mosaic Stack...</p>",
-    summary: "A comprehensive guide to getting started with the Mosaic Stack platform.",
-    status: EntryStatus.PUBLISHED,
-    visibility: Visibility.PUBLIC,
-    createdBy: "user-1",
-    updatedBy: "user-1",
-    createdAt: new Date("2026-01-20"),
-    updatedAt: new Date("2026-01-28"),
-    tags: [
-      {
-        id: "tag-1",
-        workspaceId: "workspace-1",
-        name: "Tutorial",
-        slug: "tutorial",
-        color: "#3B82F6",
-        createdAt: new Date(),
-        updatedAt: new Date(),
-      },
-      {
-        id: "tag-2",
-        workspaceId: "workspace-1",
-        name: "Onboarding",
-        slug: "onboarding",
-        color: "#10B981",
-        createdAt: new Date(),
-        updatedAt: new Date(),
-      },
-    ],
-  },
-  {
-    id: "entry-2",
-    workspaceId: "workspace-1",
-    slug: "architecture-overview",
-    title: "Architecture Overview",
-    content: "# Architecture\n\nThe Mosaic Stack architecture...",
-    contentHtml: "<h1>Architecture</h1><p>The Mosaic Stack architecture...</p>",
-    summary: "Overview of the system architecture and design patterns used in Mosaic Stack.",
-    status: EntryStatus.PUBLISHED,
-    visibility: Visibility.WORKSPACE,
-    createdBy: "user-1",
-    updatedBy: "user-1",
-    createdAt: new Date("2026-01-15"),
-    updatedAt: new Date("2026-01-27"),
-    tags: [
-      {
-        id: "tag-3",
-        workspaceId: "workspace-1",
-        name: "Architecture",
-        slug: "architecture",
-        color: "#8B5CF6",
-        createdAt: new Date(),
-        updatedAt: new Date(),
-      },
-      {
-        id: "tag-4",
-        workspaceId: "workspace-1",
-        name: "Technical",
-        slug: "technical",
-        color: "#F59E0B",
-        createdAt: new Date(),
-        updatedAt: new Date(),
-      },
-    ],
-  },
-  {
-    id: "entry-3",
-    workspaceId: "workspace-1",
-    slug: "api-documentation-draft",
-    title: "API Documentation (Draft)",
-    content: "# API Docs\n\nWork in progress...",
-    contentHtml: "<h1>API Docs</h1><p>Work in progress...</p>",
-    summary: "Comprehensive API documentation for developers.",
-    status: EntryStatus.DRAFT,
-    visibility: Visibility.PRIVATE,
-    createdBy: "user-1",
-    updatedBy: "user-1",
-    createdAt: new Date("2026-01-29"),
-    updatedAt: new Date("2026-01-29"),
-    tags: [
-      {
-        id: "tag-4",
-        workspaceId: "workspace-1",
-        name: "Technical",
-        slug: "technical",
-        color: "#F59E0B",
-        createdAt: new Date(),
-        updatedAt: new Date(),
-      },
-      {
-        id: "tag-5",
-        workspaceId: "workspace-1",
-        name: "API",
-        slug: "api",
-        color: "#EF4444",
-        createdAt: new Date(),
-        updatedAt: new Date(),
-      },
-    ],
-  },
-  {
-    id: "entry-4",
-    workspaceId: "workspace-1",
-    slug: "deployment-guide",
-    title: "Deployment Guide",
-    content: "# Deployment\n\nHow to deploy Mosaic Stack...",
-    contentHtml: "<h1>Deployment</h1><p>How to deploy Mosaic Stack...</p>",
-    summary: "Step-by-step guide for deploying Mosaic Stack to production.",
-    status: EntryStatus.PUBLISHED,
-    visibility: Visibility.WORKSPACE,
-    createdBy: "user-1",
-    updatedBy: "user-1",
-    createdAt: new Date("2026-01-18"),
-    updatedAt: new Date("2026-01-25"),
-    tags: [
-      {
-        id: "tag-6",
-        workspaceId: "workspace-1",
-        name: "DevOps",
-        slug: "devops",
-        color: "#14B8A6",
-        createdAt: new Date(),
-        updatedAt: new Date(),
-      },
-      {
-        id: "tag-1",
-        workspaceId: "workspace-1",
-        name: "Tutorial",
-        slug: "tutorial",
-        color: "#3B82F6",
-        createdAt: new Date(),
-        updatedAt: new Date(),
-      },
-    ],
-  },
-  {
-    id: "entry-5",
-    workspaceId: "workspace-1",
-    slug: "old-meeting-notes",
-    title: "Q4 2025 Meeting Notes",
-    content: "# Meeting Notes\n\nOld archived notes...",
-    contentHtml: "<h1>Meeting Notes</h1><p>Old archived notes...</p>",
-    summary: "Meeting notes from Q4 2025 - archived for reference.",
-    status: EntryStatus.ARCHIVED,
-    visibility: Visibility.PRIVATE,
-    createdBy: "user-1",
-    updatedBy: "user-1",
-    createdAt: new Date("2025-12-15"),
-    updatedAt: new Date("2026-01-05"),
-    tags: [
-      {
-        id: "tag-7",
-        workspaceId: "workspace-1",
-        name: "Meetings",
-        slug: "meetings",
-        color: "#6B7280",
-        createdAt: new Date(),
-        updatedAt: new Date(),
-      },
-    ],
-  },
-];
-
-export const mockTags: KnowledgeTag[] = [
-  {
-    id: "tag-1",
-    workspaceId: "workspace-1",
-    name: "Tutorial",
-    slug: "tutorial",
-    color: "#3B82F6",
-    createdAt: new Date(),
-    updatedAt: new Date(),
-  },
-  {
-    id: "tag-2",
-    workspaceId: "workspace-1",
-    name: "Onboarding",
-    slug: "onboarding",
-    color: "#10B981",
-    createdAt: new Date(),
-    updatedAt: new Date(),
-  },
-  {
-    id: "tag-3",
-    workspaceId: "workspace-1",
-    name: "Architecture",
-    slug: "architecture",
-    color: "#8B5CF6",
-    createdAt: new Date(),
-    updatedAt: new Date(),
-  },
-  {
-    id: "tag-4",
-    workspaceId: "workspace-1",
-    name: "Technical",
-    slug: "technical",
-    color: "#F59E0B",
-    createdAt: new Date(),
-    updatedAt: new Date(),
-  },
-  {
-    id: "tag-5",
-    workspaceId: "workspace-1",
-    name: "API",
-    slug: "api",
-    color: "#EF4444",
-    createdAt: new Date(),
-    updatedAt: new Date(),
-  },
-  {
-    id: "tag-6",
-    workspaceId: "workspace-1",
-    name: "DevOps",
-    slug: "devops",
-    color: "#14B8A6",
-    createdAt: new Date(),
-    updatedAt: new Date(),
-  },
-  {
-    id: "tag-7",
-    workspaceId: "workspace-1",
-    name: "Meetings",
-    slug: "meetings",
-    color: "#6B7280",
-    createdAt: new Date(),
-    updatedAt: new Date(),
-  },
-];