feat(frontend): storage shows the heaviest chats, a chat opens its own files with selective cleanup and a whole-chat move to trash

frontend/src/lib/stores/ui.svelte.ts

@@ -16,6 +16,7 @@ export type RightPanel =
   | "shares"
   | "bots"
   | "storage"
+  | "storage-chat"
   | "storage-trash";
 
 export type LeftView = "main" | "settings";