Remove disconnect button; picking Local or closing the tab covers it

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

ui/src/app/file-panel/file-panel.html

@@ -21,16 +21,6 @@
       size="calc(var(--action-icon) - 0.1rem)"
     />
   </button>
-  @if (isRemote()) {
-    <button
-      (click)="disconnect()"
-      title="Disconnect (back to local)"
-      class="grid size-(--action-h) shrink-0 place-items-center rounded-md text-muted-foreground hover:bg-accent hover:text-foreground"
-    >
-      <ng-icon name="mynaLogout" size="var(--action-icon)" />
-    </button>
-  }
-
   <div class="flex-1"></div>
 
   <!-- panel actions: act on THIS panel. Frequent/destructive verbs grow text