feat: Notion page editor — top bar, share modal, star toggle, empty toolbar

Replicates Notion's page layout from reference images:
- Top bar: Private badge, Share button, Link copy, Star/favorite toggle, ⋮ menu
- Share modal: Publish toggle, Copy link, Invite people with permission select
- Empty page toolbar: Get started with H1/H2/H3/bullet/todo/callout/quote
- Star toggle integrated with favorites API (POST/DELETE /board/api/favorites)
- board.py view_page now passes workspace context + page_favorited
- dashboard.py view_page_root also passes page_favorited
- CSS: .page-topbar, .share-modal, .empty-page-toolbar, toggle switch, more menu

app/routers/board.py

@@ -720,8 +720,19 @@ async def view_page(request: Request, page_id: int):
         row = conn.execute("SELECT * FROM pages WHERE id=?", (page_id,)).fetchone()
         if not row:
             return HTMLResponse("<h2>Page not found</h2>", status_code=404)
-    sidebar = _sidebar_data(request)
-    ctx = {**sidebar, "page": dict(row)}
+    page = dict(row)
+    ws = page.get("workspace", "")
+    parts = ws.split("/") if "/" in ws else ["", ""]
+    owner, repo = parts[0], parts[1] if len(parts) > 1 else ""
+    sidebar = _sidebar_data(request, owner, repo)
+    # Check if page is favorited
+    user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
+    uid = user["id"] if user and user.get("id") else 1
+    with get_conn() as conn:
+        fav = conn.execute(
+            "SELECT id FROM favorites WHERE user_id=? AND page_id=?", (uid, page_id)
+        ).fetchone()
+    ctx = {**sidebar, "page": page, "page_favorited": fav is not None}
     template = env.get_template("page_editor.html")
     return template.render(**ctx)
 

app/routers/dashboard.py

@@ -166,7 +166,7 @@ async def view_page_root(request: Request, page_id: int):
             "SELECT id, title FROM pages WHERE parent_id=? ORDER BY updated_at DESC",
             (page_id,),
         ).fetchall()
-    ctx = {**sidebar, "page": page, "sub_pages": [dict(s) for s in subs]}
+    ctx = {**sidebar, "page": page, "sub_pages": [dict(s) for s in subs], "page_favorited": False}
     template = env.get_template("page_editor.html")
     return template.render(**ctx)