P2: file operations with dialogs (mkdir, new file, rename, delete, chmod)

- prompt/confirm/chmod dialogs (signals-driven via DialogsService)
- FileActionsService: acts on selection or cursor row of the active panel
- function bar + F2/F7/F8/Delete keys; delete confirms and recurses
- verified provider ops + walkTree + removeRecursive on a scratch tree

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

ui/src/app/app.html

@@ -19,6 +19,56 @@
       <app-file-panel side="left" />
       <app-file-panel side="right" />
     </main>
+
+    <!-- function bar: acts on the active panel -->
+    <footer class="flex items-center gap-1 border-t border-border px-2 py-1">
+      <button
+        (click)="actions.rename()"
+        title="Rename (F2)"
+        class="flex items-center gap-1.5 rounded-md px-2 py-1 text-xs text-muted-foreground hover:bg-accent hover:text-foreground"
+      >
+        <ng-icon name="mynaEdit" size="0.9rem" /> Rename
+      </button>
+      <button
+        (click)="actions.mkdir()"
+        title="New folder (F7)"
+        class="flex items-center gap-1.5 rounded-md px-2 py-1 text-xs text-muted-foreground hover:bg-accent hover:text-foreground"
+      >
+        <ng-icon name="mynaFolderPlus" size="0.9rem" /> Folder
+      </button>
+      <button
+        (click)="actions.createFile()"
+        title="New file"
+        class="flex items-center gap-1.5 rounded-md px-2 py-1 text-xs text-muted-foreground hover:bg-accent hover:text-foreground"
+      >
+        <ng-icon name="mynaFilePlus" size="0.9rem" /> File
+      </button>
+      <button
+        (click)="actions.chmod()"
+        title="Permissions"
+        class="flex items-center gap-1.5 rounded-md px-2 py-1 text-xs text-muted-foreground hover:bg-accent hover:text-foreground"
+      >
+        <ng-icon name="mynaLock" size="0.9rem" /> Permissions
+      </button>
+      <button
+        (click)="actions.delete()"
+        title="Delete (F8 / Del)"
+        class="flex items-center gap-1.5 rounded-md px-2 py-1 text-xs text-muted-foreground hover:bg-accent hover:text-destructive"
+      >
+        <ng-icon name="mynaTrash" size="0.9rem" /> Delete
+      </button>
+    </footer>
+  }
+
+  <!-- dialogs -->
+  @if (dialogs.prompt(); as req) {
+    <app-prompt-dialog [request]="req" />
+  }
+  @if (dialogs.confirm(); as req) {
+    <app-confirm-dialog [request]="req" />
+  }
+  @if (dialogs.chmod(); as req) {
+    <app-chmod-dialog [request]="req" />
   }
 
   <!-- toasts -->