feat: Move to, Gitea context menu, Activity popover

Move to workspace:
- movePage() opens a dialog listing all workspaces via /api/workspaces
- doMove(wsId) calls PUT /api/pages/{id}/move with workspace_id
- Updated move API to accept JSON body with workspace_id for cross-workspace moves

Gitea workspace context menu:
- Right-click on any file/folder shows Rename + Delete options
- gwRename() prompts for new name, calls PUT /api/gitea/.../file
- gwDelete() confirms then calls DELETE /api/gitea/.../file
- Both trigger refreshTree() after success

Activity popover:
- 'Edited X ago' timestamp is now clickable (▾ indicator)
- Opens popover showing edited time + created date
- formatDate() helper for readable date formatting

app/routers/board.py

@@ -5,7 +5,7 @@ import json
 import logging
 
 from fastapi import APIRouter, Request, HTTPException, Query
-from fastapi.responses import HTMLResponse
+from fastapi.responses import HTMLResponse, JSONResponse
 
 from app.db import get_conn
 from app.services.gitea_client import gitea
@@ -857,42 +857,49 @@ async def save_page_blocks(request: Request, page_id: int):
 
 
 @router.put("/api/pages/{page_id}/move")
-async def move_page(request: Request, page_id: int,
-                     new_parent_id: int = Query(default=0),
-                     new_order: int = Query(default=0)):
-    """Move/reorder a page in the tree (drag & drop).
-    new_parent_id=0 means move to root level.
-    new_order=0 means append to end (or set explicit position)."""
+async def move_page(request: Request, page_id: int):
+    """Move a page to another workspace or reorder within tree.
+    
+    Body (JSON): { workspace_id?: int, parent_id?: int, new_order?: int }
+    - workspace_id: move page to a different workspace
+    - parent_id: change parent (0 = root level)
+    - new_order: position among siblings (0 = append)
+    """
+    try:
+        body = await request.json()
+    except Exception:
+        body = {}
+    new_ws_id = body.get("workspace_id")
+    new_parent_id = body.get("parent_id", 0)
+    new_order = body.get("new_order", 0)
+    
     with get_conn() as conn:
-        # Verify page exists
-        row = conn.execute("SELECT id, workspace FROM pages WHERE id=?", (page_id,)).fetchone()
+        row = conn.execute("SELECT id, workspace, workspace_id FROM pages WHERE id=?", (page_id,)).fetchone()
         if not row:
             raise HTTPException(404, "Page not found")
-        # Update parent (None for root level)
-        conn.execute(
-            "UPDATE pages SET parent_id=?, updated_at=CURRENT_TIMESTAMP WHERE id=?",
-            (new_parent_id if new_parent_id > 0 else None, page_id),
-        )
-        # Update sort order
-        conn.execute(
-            "UPDATE pages SET sort_order=?, updated_at=CURRENT_TIMESTAMP WHERE id=?",
-            (new_order, page_id),
-        )
-        # Re-index siblings to ensure no gaps
-        siblings = conn.execute(
-            "SELECT id, sort_order FROM pages WHERE workspace=? AND parent_id IS ? AND id != ? ORDER BY sort_order ASC",
-            (row["workspace"], new_parent_id if new_parent_id > 0 else None, page_id),
-        ).fetchall()
-        # Recompute sort_order for all siblings after the insertion point
-        insert_point = new_order
-        reorder = []
-        for sib in siblings:
-            if sib["sort_order"] >= insert_point:
-                reorder.append(sib["id"])
-        for i, sid in enumerate(sorted(reorder, key=lambda x: next(s["sort_order"] for s in siblings if s["id"] == x))):
-            conn.execute("UPDATE pages SET sort_order=? WHERE id=?", (insert_point + i + 1, sid))
+        
+        if new_ws_id:
+            # Move to a different workspace: get the workspace name
+            ws_row = conn.execute("SELECT name FROM workspaces WHERE id=?", (new_ws_id,)).fetchone()
+            if not ws_row:
+                return JSONResponse({"status": "error", "detail": "Workspace not found"}, status_code=404)
+            conn.execute(
+                "UPDATE pages SET workspace_id=?, workspace=?, parent_id=NULL, updated_at=CURRENT_TIMESTAMP WHERE id=?",
+                (new_ws_id, ws_row["name"], page_id),
+            )
+        else:
+            # Reorder within same workspace
+            conn.execute(
+                "UPDATE pages SET parent_id=?, updated_at=CURRENT_TIMESTAMP WHERE id=?",
+                (new_parent_id if new_parent_id > 0 else None, page_id),
+            )
+            conn.execute(
+                "UPDATE pages SET sort_order=?, updated_at=CURRENT_TIMESTAMP WHERE id=?",
+                (new_order, page_id),
+            )
+        
         conn.commit()
-    return {"status": "ok", "id": page_id, "parent_id": new_parent_id, "order": new_order}
+    return {"status": "ok", "id": page_id}
 
 
 @router.delete("/api/pages/{page_id}")