fix: settings save and session deletion bugs

Settings save:
- Remove exclude_none=True from user_config.py model_dump() call
- Fixes fields not updating when cleared or set to null/undefined

Session deletion:
- Add project_id and repository_id to get_user_sessions response
- Update frontend Session interface with new fields
- Fix handleDelete to use IDs instead of names, resolving 404 errors

apps/web/src/api/sessions.ts

@@ -20,7 +20,9 @@ export interface Session {
   tool_icon: string;
   tool_type_interfaces: string[];
   repository_name: string;
+  repository_id: string;
   project_name: string;
+  project_id: string;
   status: string;
   url: string | null;
 }