feat(ui): add maintenance page for task management

* Implement maintenance page with task and log display
* Add backfill and metadata retry functionality
* Integrate grid component for project display in thoughts page
* Update types for maintenance tasks and logs
* Enhance sidebar and shell for new maintenance navigation

ui/src/App.svelte

@@ -111,7 +111,27 @@
       if (!response.ok) {
         throw new Error(`Status request failed with ${response.status}`);
       }
-      data = (await response.json()) as StatusResponse;
+      const raw = (await response.json()) as Partial<StatusResponse> | null;
+      data = {
+        title: raw?.title ?? 'AMCS',
+        description: raw?.description ?? '',
+        version: raw?.version ?? 'unknown',
+        build_date: raw?.build_date ?? 'unknown',
+        commit: raw?.commit ?? 'unknown',
+        connected_count: raw?.connected_count ?? 0,
+        total_known: raw?.total_known ?? 0,
+        connected_window: raw?.connected_window ?? 'last 10 minutes',
+        oauth_enabled: !!raw?.oauth_enabled,
+        entries: Array.isArray(raw?.entries) ? raw.entries : [],
+        metrics: {
+          total_requests: raw?.metrics?.total_requests ?? 0,
+          unique_principals: raw?.metrics?.unique_principals ?? 0,
+          unique_ips: raw?.metrics?.unique_ips ?? 0,
+          unique_agents: raw?.metrics?.unique_agents ?? 0,
+          top_ips: Array.isArray(raw?.metrics?.top_ips) ? raw.metrics.top_ips : [],
+          top_agents: Array.isArray(raw?.metrics?.top_agents) ? raw.metrics.top_agents : []
+        }
+      };
     } catch (err) {
       error = err instanceof Error ? err.message : 'Failed to load status';
     } finally {