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/file-panel/file-panel.ts

@@ -10,6 +10,7 @@ import {
 } from '@angular/core';
 import { NgIcon } from '@ng-icons/core';
 import type { FileEntry } from '@shared/types';
+import { FileActionsService } from '../file-actions.service';
 import { formatDate, formatSize } from '../format';
 import { PanelsService, type Side, type SortKey } from '../panels.service';
 
@@ -23,6 +24,7 @@ export class FilePanel {
   readonly side = input.required<Side>();
 
   readonly panels = inject(PanelsService);
+  readonly actions = inject(FileActionsService);
   readonly panel = computed(() => this.panels.get(this.side()));
   readonly isActive = computed(() => this.panels.activeSide() === this.side());
 
@@ -37,8 +39,9 @@ export class FilePanel {
   constructor() {
     // keep the editable path bar in sync with the actual cwd
     effect(() => this.pathDraft.set(this.panel().cwd()));
-    // focus follows the active side (Tab switches panels)
+    // focus follows the active side (Tab switches panels, dialogs refocus on close)
     effect(() => {
+      this.panels.focusTick();
       if (this.isActive()) this.listEl().nativeElement.focus();
     });
   }
@@ -138,6 +141,16 @@ export class FilePanel {
       case 'Backspace':
         panel.up();
         break;
+      case 'F2':
+        this.actions.rename();
+        break;
+      case 'F7':
+        this.actions.mkdir();
+        break;
+      case 'F8':
+      case 'Delete':
+        this.actions.delete();
+        break;
       default:
         return; // let unhandled keys through
     }