Decouple dialog refocus from PanelsService via FocusService

Dialogs only needed refocus(); injecting PanelsService boots a whole
workspace, which secondary windows must not do.

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

ui/src/app/dialogs/prompt-dialog.ts

@@ -8,7 +8,7 @@ import {
   viewChild,
 } from '@angular/core';
 import { DialogsService, type PromptRequest } from '../dialogs.service';
-import { PanelsService } from '../panels.service';
+import { FocusService } from '../focus.service';
 
 @Component({
   selector: 'app-prompt-dialog',
@@ -54,7 +54,7 @@ export class PromptDialog {
 
   private readonly box = viewChild.required<ElementRef<HTMLInputElement>>('box');
   private readonly dialogs = inject(DialogsService);
-  private readonly panels = inject(PanelsService);
+  private readonly focus = inject(FocusService);
 
   constructor() {
     afterNextRender(() => {
@@ -79,6 +79,6 @@ export class PromptDialog {
 
   private close(): void {
     this.dialogs.prompt.set(null);
-    this.panels.refocus();
+    this.focus.bump();
   }
 }