feat(ui): badge version visible + FAB AI flottant

tests/frontend/unit.test.mjs

@@ -187,6 +187,25 @@ function testAdminModuleSyntax() {
   console.log('  ✓ admin.js parses without syntax errors');
 }
 
+// ── Test ai-fab.js (FAB — Floating Action Button) ─────────────────────────
+const AIFAB_PATH = join(JS_DIR, 'ai-fab.js');
+
+function testAIFabModuleExists() {
+  const content = readFileSync(AIFAB_PATH, 'utf-8');
+  assert.ok(content.length > 0, 'ai-fab.js must be a non-empty file');
+  assert.ok(/from\s+['"]\.\/bookslm\.js['"]/.test(content), 'ai-fab.js must import from ./bookslm.js');
+  assert.ok(/from\s+['"]\.\/state\.js['"]/.test(content), 'ai-fab.js must import from ./state.js');
+  assert.ok(/from\s+['"]\.\/i18n\.js['"]/.test(content), 'ai-fab.js must import from ./i18n.js');
+  console.log('  ✓ ai-fab.js exists and imports the expected modules');
+}
+
+function testAIFabModuleExports() {
+  const content = readFileSync(AIFAB_PATH, 'utf-8');
+  const exported = _collectExportedNames(content);
+  assert.ok(exported.has('initAIFab'), 'ai-fab.js must export initAIFab');
+  console.log('  ✓ ai-fab.js exports initAIFab');
+}
+
 // ── Run all tests ──────────────────────────────────────────────────────────
 async function main() {
   let passed = 0, failed = 0;
@@ -199,6 +218,8 @@ async function main() {
     ['admin module exists', testAdminModuleExists],
     ['admin module exports', testAdminModuleExports],
     ['admin module syntax', testAdminModuleSyntax],
+    ['ai-fab module exists', testAIFabModuleExists],
+    ['ai-fab module exports', testAIFabModuleExports],
   ];
 
   for (const [name, fn] of tests) {