feat: add UI to edit role default page permissions

dashboard/backend/routers/auth.py

@@ -403,3 +403,19 @@ async def rbac_delete_override(username: str, current_user = Depends(auth.get_cu
     rbac.get("user_overrides", {}).pop(username, None)
     save_rbac(rbac)
     return {"ok": True}
+
+@router.put("/rbac/roles/{role}")
+async def rbac_update_role(role: str, request: Request, current_user = Depends(auth.get_current_user)):
+    if current_user.role != "admin":
+        raise HTTPException(status_code=403, detail="Admin only")
+    from rbac import load_rbac, save_rbac
+    body = await request.json()
+    pages = body.get("pages")
+    if pages is None:
+        raise HTTPException(status_code=400, detail="Missing pages field")
+    if pages != "*" and not isinstance(pages, list):
+        raise HTTPException(status_code=400, detail="pages must be '*' or a list")
+    rbac = load_rbac()
+    rbac.setdefault("role_defaults", {})[role] = {"pages": pages}
+    save_rbac(rbac)
+    return {"ok": True}