feat(workspace): add hashtag indexing, tag pages and bullet group view

frontend/src/lib/api.ts

@@ -17,6 +17,8 @@ import {
   TaskList,
   Thought,
   SubTask,
+  TagDetails,
+  TagSummary,
   User,
   UserInvite,
   WSMessage,
@@ -388,6 +390,27 @@ export const api = {
     );
   },
 
+  // --- WORKSPACE TAGS ---
+  async getWorkspaceTags(): Promise<TagSummary[]> {
+    const res = await request<TagSummary[]>('/api/v1/workspace/tags');
+    return ensureArray(res);
+  },
+
+  async getTagDetails(tag: string): Promise<TagDetails> {
+    const clean = encodeURIComponent(tag.replace(/^#/, ''));
+    const res = await request<TagDetails>(`/api/v1/workspace/tags/${clean}`);
+    return {
+      ...res,
+      documents: ensureArray(res.documents).map((doc) => ({
+        ...doc,
+        matchedBlocks: ensureArray(doc.matchedBlocks).map((mb) => ({
+          rootBlock: mb.rootBlock,
+          children: ensureArray(mb.children),
+        })),
+      })),
+    };
+  },
+
   // --- WORKSPACE DOCUMENTS ---
   async getDocuments(): Promise<Document[]> {
     const res = await request<Document[]>('/api/v1/documents');

frontend/src/lib/types.ts

@@ -170,6 +170,34 @@ export interface Document {
   sharedWith?: DocShare[];
 }
 
+export interface TagSummary {
+  tag: string;
+  count: number;
+}
+
+export interface MatchedTagBlock {
+  rootBlock: DocumentBlock;
+  children: DocumentBlock[];
+}
+
+export interface TagDocumentGroup {
+  docId: string;
+  title: string;
+  icon: string;
+  folderPath: string;
+  updatedAt: string;
+  isOwner: boolean;
+  permission: 'owner' | 'write' | 'read';
+  ownerName?: string;
+  matchedBlocks: MatchedTagBlock[];
+}
+
+export interface TagDetails {
+  tag: string;
+  documents: TagDocumentGroup[];
+  totalMatches: number;
+}
+
 export interface SpaceMember {
   spaceId: string;
   userId: string;