fix: context menu implémenté + page editor CSRF + workspace context

- Context menu: toutes les actions fonctionnelles (favorite, copyLink, duplicate, rename, move, delete, openTab)
- Page editor: CSRF token ajouté dans save() et saveTitle()
- Page editor: workspace context restauré (owner/repo extrait de pages.workspace)
- Route /pages/{id}: utilise board._sidebar_data pour préserver le contexte projet

app/routers/dashboard.py

@@ -58,15 +58,20 @@ async def library_page(request: Request):
 
 @router.get("/pages/{page_id}", response_class=HTMLResponse)
 async def view_page_root(request: Request, page_id: int):
-    """Render a Markdown page at root level."""
+    """Render a Markdown page at root level with workspace context."""
     from jinja2 import Environment, FileSystemLoader
+    from app.routers.board import _sidebar_data as board_sidebar
     env = Environment(loader=FileSystemLoader("app/templates"))
-    sidebar = _sidebar_data(request, [])
     with get_conn() as conn:
         row = conn.execute("SELECT * FROM pages WHERE id=?", (page_id,)).fetchone()
         if not row:
             return HTMLResponse("<h2>Page not found</h2>", status_code=404)
-    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 = board_sidebar(request, owner, repo)
+    ctx = {**sidebar, "page": page}
     template = env.get_template("page_editor.html")
     return template.render(**ctx)