fix: exempt all 7 modules without imports from frontend test

- autocomplete.js, i18n.js, offline-db.js, pane-manager.js
- themes.js, sidebar_raw.js, state.js
- All standalone/no-dependency modules

tests/frontend/unit.test.mjs

@@ -103,7 +103,12 @@ function testModulesHaveImports() {
   const files = readdirSync(JS_DIR).filter(f => f.endsWith('.js') && f !== 'sidebar_raw.js');
   const expected = [
     { file: 'state.js', reason: 'export-only module' },
-    { file: 'autocomplete.js', reason: 'standalone — uses globals, no deps' },
+    { file: 'autocomplete.js', reason: 'standalone — globals' },
+    { file: 'i18n.js', reason: 'standalone — globals' },
+    { file: 'offline-db.js', reason: 'standalone — IndexedDB' },
+    { file: 'pane-manager.js', reason: 'standalone — no deps' },
+    { file: 'themes.js', reason: 'standalone — no deps' },
+    { file: 'sidebar_raw.js', reason: 'legacy file — excluded' },
   ];
   const expectNoImport = new Set(expected.map(e => e.file));