Add component tests for presentational components and Login

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/components/Search.test.js

@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest';
+import { mount } from '@vue/test-utils';
+import Search from '@/components/Search.vue';
+
+describe('Search', () => {
+  it('renders search form', () => {
+    const wrapper = mount(Search);
+    expect(wrapper.find('form[role="search"]').exists()).toBe(true);
+  });
+
+  it('contains search input', () => {
+    const wrapper = mount(Search);
+    const input = wrapper.find('input[type="search"]');
+    expect(input.exists()).toBe(true);
+    expect(input.attributes('placeholder')).toBe('Search Activity');
+  });
+});