v1.1: fix transfer freeze, session tabs, per-panel toolbars, status bar

Freeze root cause: TransfersService consumed transferUpdate through an effect
that both read and wrote the jobMap signal — the first progress message spun
the effect into an infinite re-run loop, pegging the webview thread while the
copy completed fine bun-side. Push messages now flow through plain callback
registries on RpcService (also stops signal coalescing from dropping progress
snapshots). Verified live: a 60MB boot-time self-test copy streamed progress
into the running UI and the post-completion panel refreshes arrived.

- Tabs: workspaces (left+right PanelState pair each) in PanelsService; tab bar
  replaces the header; sessions persist in background tabs; Cmd+T/Cmd+W/Ctrl+Tab;
  closing a tab disconnects its sessions; last tab can't close
- Per-panel toolbar (top, icon-only): direction-explicit copy (-> / <-),
  rename, new folder/file, chmod, delete; panel footers removed
- VSCode-style status bar: transfer summary (spinner/percent/queued/failures,
  click to expand the job list) + active panel info; function bar removed
- transfer details list is collapsible, auto-expands on failure

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ui/src/app/app.ts

@@ -6,18 +6,21 @@ import { ChmodDialog } from './dialogs/chmod-dialog';
 import { ConfirmDialog } from './dialogs/confirm-dialog';
 import { PromptDialog } from './dialogs/prompt-dialog';
 import { DialogsService } from './dialogs.service';
-import { FileActionsService } from './file-actions.service';
 import { FilePanel } from './file-panel/file-panel';
+import { PanelsService } from './panels.service';
 import { RpcService } from './rpc.service';
+import { StatusBar } from './status-bar/status-bar';
+import { TabBar } from './tab-bar/tab-bar';
 import { ToastService } from './toast.service';
 import { TransferBar } from './transfer-bar/transfer-bar';
-import { TransfersService } from './transfers.service';
 
 @Component({
   selector: 'app-root',
   imports: [
     NgIcon,
     FilePanel,
+    TabBar,
+    StatusBar,
     PromptDialog,
     ConfirmDialog,
     ChmodDialog,
@@ -25,19 +28,33 @@ import { TransfersService } from './transfers.service';
     ConnectionManager,
   ],
   templateUrl: './app.html',
+  host: { '(window:keydown)': 'onWindowKeydown($event)' },
 })
 export class App {
-  readonly appName = BRANDING.appName;
   readonly rpc = inject(RpcService);
   readonly toast = inject(ToastService);
   readonly dialogs = inject(DialogsService);
-  readonly actions = inject(FileActionsService);
-  readonly transfers = inject(TransfersService);
+  readonly panels = inject(PanelsService);
 
   constructor() {
     document.title = BRANDING.appName;
   }
 
+  /** Tab (workspace) shortcuts — panel-level keys live on the panels themselves. */
+  onWindowKeydown(event: KeyboardEvent): void {
+    const mod = event.metaKey || event.ctrlKey;
+    if (mod && event.key.toLowerCase() === 't') {
+      event.preventDefault();
+      this.panels.newWorkspace();
+    } else if (mod && event.key.toLowerCase() === 'w') {
+      event.preventDefault();
+      this.panels.closeWorkspace(this.panels.activeWorkspaceId());
+    } else if (event.ctrlKey && event.key === 'Tab') {
+      event.preventDefault();
+      this.panels.cycleWorkspace(event.shiftKey ? -1 : 1);
+    }
+  }
+
   toastIcon(kind: 'error' | 'info' | 'success'): string {
     if (kind === 'error') return 'mynaXCircle';
     if (kind === 'success') return 'mynaCheckCircle';