Address PR review feedback on frontend test coverage

Enforce a 50% line-coverage floor in vitest.config.js so the
static/js/ gain cannot silently regress. Restore mocks after export
tests to prevent createElement spy leakage, and document fixture
shapes plus the search.js no-highlight behavior for future maintainers.

Author: clean6378-max-it

static/js/export.test.js

@@ -1,4 +1,4 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 import { bulkExport, downloadSession } from './export.js';
 
 vi.mock('./projects.js', () => ({ showProjects: vi.fn() }));
@@ -29,6 +29,10 @@ describe('export', () => {
         showProjects.mockClear();
     });
 
+    afterEach(() => {
+        vi.restoreAllMocks();
+    });
+
     async function confirmExport() {
         const ok = document.querySelector('.confirm-ok');
         expect(ok).not.toBeNull();

static/js/projects.test.js

@@ -1,6 +1,7 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 import { showProjects } from './projects.js';
 
+// ProjectDict[] — mirrors models/project.py.
 const PROJECT_FIXTURE = [
     {
         name: 'alpha',

static/js/search.test.js

@@ -1,6 +1,7 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 import { showSearchPage, doSearch } from './search.js';
 
+// SearchHitDict[] — mirrors models/search.py (no highlight wrapper in search.js; snippets are escaped text only).
 const SEARCH_HITS = [
     {
         project: 'alpha',

static/js/sessions.test.js

@@ -2,6 +2,7 @@ import { beforeEach, describe, expect, it, vi } from 'vitest';
 import { state } from './shared/state.js';
 import { showWorkspace, loadSession, selectSession, copyAll } from './sessions.js';
 
+// Session list + detail shapes mirror models/session.py (ProjectSessionRowDict / SessionDict).
 const SESSION_LIST = [
     {
         id: 'sess-1',

vitest.config.js

@@ -9,6 +9,9 @@ export default defineConfig({
             reporter: ['text', 'lcov'],
             include: ['static/js/**/*.js'],
             exclude: ['static/js/**/*.test.js'],
+            thresholds: {
+                lines: 50,
+            },
         },
     },
 });