test(projects): fix ProjectCard change-trigger target

Pre-existing failing test from commit c9ee8d8 — data-testid lives on
<label>, but @change handler sits on <input> inside it. jsdom does not
bubble change-event from label to input via @vue/test-utils trigger.
Use child-input selector to fire the event on the right node.

Baseline после fix: 614 passed / 3 skipped / 0 failed (vs 613 / 3 / 1).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/tests/Frontend/ProjectCard.spec.ts

@@ -39,7 +39,7 @@ describe('ProjectCard', () => {
             global: { plugins: [vuetify] },
             props: { project: baseProject, selected: false },
         });
-        await wrapper.find('[data-testid="card-select"]').trigger('change');
+        await wrapper.find('[data-testid="card-select"] input').trigger('change');
         expect(wrapper.emitted('toggle-select')).toBeTruthy();
     });