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

internal/app/status.go

@@ -25,6 +25,7 @@ type statusAPIResponse struct {
 	TotalKnown      int                   `json:"total_known"`
 	ConnectedWindow string                `json:"connected_window"`
 	Entries         []auth.AccessSnapshot `json:"entries"`
+	Metrics         auth.AccessMetrics    `json:"metrics"`
 	OAuthEnabled    bool                  `json:"oauth_enabled"`
 }
 
@@ -40,6 +41,7 @@ func statusSnapshot(info buildinfo.Info, tracker *auth.AccessTracker, oauthEnabl
 		TotalKnown:      len(entries),
 		ConnectedWindow: "last 10 minutes",
 		Entries:         entries,
+		Metrics:         tracker.Metrics(20),
 		OAuthEnabled:    oauthEnabled,
 	}
 }