fix(gui-v2): rename AppDialog test stub off reserved HTML name "Dialog"

vue/no-reserved-component-names is error-level; <dialog> is native HTML.
Matching is via the stubs key + findComponent reference, not the stub's
own name, so the rename is behaviour-neutral (14/14 tests still pass).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/app/src/components-v2/shared/__tests__/AppDialog.spec.ts

@@ -37,7 +37,12 @@ import AppDialog from '@/components-v2/shared/AppDialog.vue'
  * without inspecting internal Vue internals.
  */
 const DialogStub = defineComponent({
-  name: 'Dialog',
+  // Not `name: 'Dialog'` — <dialog> is a native HTML element and
+  // vue/no-reserved-component-names (error) forbids it. VTU matches this
+  // stub via the `stubs: { Dialog: DialogStub }` key (AppDialog's import
+  // name) and `findComponent(DialogStub)` by reference, NOT this `name`,
+  // so renaming it here is behaviour-neutral.
+  name: 'DialogStub',
   props: {
     visible: { type: Boolean, default: false },
     modal: { type: Boolean, default: false },