fix: route /pages/{id} accessible à la racine — création pages fonctionnelle

- Ajouté /pages/{page_id} dans dashboard.py (route racine, pas /board/pages/...)
- La redirection après création de page fonctionne maintenant
- Les pages Markdown s'affichent correctement

app/routers/dashboard.py

@@ -67,6 +67,21 @@ async def library_page(request: Request):
     return template.render(**sidebar)
 
 
+@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."""
+    from jinja2 import Environment, FileSystemLoader
+    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)}
+    template = env.get_template("page_editor.html")
+    return template.render(**ctx)
+
+
 @router.get("/", response_class=HTMLResponse)
 async def dashboard(
     request: Request,