refactor(client): migrate ui-state.js → client/ui-state.ts (first real

frontend module conversion)

ui-state was the smallest, most isolated module: 35 lines, zero legacy-
global dependencies, single concern (localStorage helpers under the
'ped_ui/' namespace). Ideal first migration to validate the strangler-
fig pattern end-to-end.

Changes:
- New: client/ui-state.ts — exports get/set/del + UIState bundle.
  Keeps (window as any).UIState = UIState assignment so the 10+ legacy
  consumers (sub-nav.js, peGuide.js, app.js, etc.) keep working without
  modification. As each consumer is migrated, it will replace the
  window.UIState read with an explicit import.
- client/main.ts: import './ui-state' so it gets bundled into main.js.
- scripts/build-client.mjs: explicit ENTRIES list (just 'main.ts' for
  now) — was scanning every top-level .ts as an entry, which produced
  duplicate ui-state.js bundle.
- public/index.html: <script defer src="/js/ui-state.js"> removed; the
  TS bundle (/dist/main.js) now provides window.UIState.
- public/js/ui-state.js: deleted (now lives in client/).

Verification:
- npm run typecheck:client → 0 errors
- npm run build:client → 349-byte main.js bundle (gzipped will be ~200B)
- 46/46 unit tests pass
- The 10 cross-file consumers of UIState.get/set/del still work because
  the window assignment lives in the bundle.

Pattern documented for next migrations: each new client/X.ts is
imported as a side-effect from main.ts. The window-bridge stays until
every consumer also moves to ES imports.

client/main.ts

@@ -18,6 +18,10 @@
 //     (voice/STT plumbing)
 // ============================================================
 
+// Migrated modules — each side-effect import installs its window-global
+// shim for legacy consumers and self-registers any DOM listeners.
+import './ui-state';
+
 console.log('[client] TypeScript bundle loaded.');
 
 // Marker so anything else that wants to know if the bundle reached

client/ui-state.ts

@@ -0,0 +1,37 @@
+// ============================================================
+// client/ui-state.ts — sub-pill / sub-tab persistence across browser restart.
+//
+// First file migrated out of public/js/ as ES module + TypeScript.
+// Tab-level selection (ped_last_tab) is handled in app.js (still legacy).
+// This file persists finer-grained choices that would otherwise reset
+// to defaults when the user closes the browser, signs out / back in,
+// or reloads the page — because _componentCache is in-memory only.
+//
+// All keys live under "ped_ui/" in localStorage. Reads and writes are
+// wrapped in try/catch — localStorage can throw in some contexts
+// (Safari private mode, storage quotas), and a persistence failure
+// must never break the UI.
+//
+// Compat: window.UIState is still assigned for the 10+ legacy consumers
+// (app.js, sub-nav.js, several IIFE modules). Once those are migrated
+// to ES module imports, the window assignment can be removed.
+// ============================================================
+
+const PREFIX = 'ped_ui/';
+
+export function get(key: string): string | null {
+  try { return localStorage.getItem(PREFIX + key); } catch (e) { return null; }
+}
+
+export function set(key: string, value: string): void {
+  try { localStorage.setItem(PREFIX + key, value); } catch (e) { /* swallow — see header */ }
+}
+
+export function del(key: string): void {
+  try { localStorage.removeItem(PREFIX + key); } catch (e) { /* swallow */ }
+}
+
+export const UIState = { get, set, del };
+
+// Legacy bridge — kept until every consumer is migrated to ES imports.
+(window as any).UIState = UIState;

public/index.html

@@ -452,7 +452,7 @@
   <script defer src="/js/transcriptionSettings.js"></script>
   <script defer src="/js/voicePreferences.js"></script>
   <script defer src="/js/app.js"></script>
-  <script defer src="/js/ui-state.js"></script>
+  <!-- ui-state.js migrated → client/ui-state.ts (loaded via /dist/main.js) -->
   <script defer src="/js/secureStorage.js"></script>
   <script defer src="/js/authFetch.js"></script>
   <script defer src="/js/auth.js"></script>

public/js/ui-state.js

@@ -1,35 +0,0 @@
-// ============================================================
-// UI STATE — sub-pill / sub-tab persistence across browser restart
-// ============================================================
-// Tab-level selection (ped_last_tab) is handled in app.js. This file
-// persists the finer-grained choices that would otherwise reset to
-// defaults when the user closes the browser, signs out / back in, or
-// reloads the page — because _componentCache is in-memory and cleared
-// on reload.
-//
-// All keys live under the "ped_ui/" namespace in localStorage so they
-// are easy to enumerate and clear. Reads and writes are wrapped in
-// try/catch — localStorage can throw in some contexts (Safari private
-// mode, storage quotas), and a persistence failure must never break
-// the UI.
-// ============================================================
-
-(function () {
-  var PREFIX = 'ped_ui/';
-
-  function get(key) {
-    try { return localStorage.getItem(PREFIX + key); } catch (e) { return null; }
-  }
-  function set(key, value) {
-    try { localStorage.setItem(PREFIX + key, value); } catch (e) {}
-  }
-  function del(key) {
-    try { localStorage.removeItem(PREFIX + key); } catch (e) {}
-  }
-
-  window.UIState = {
-    get: get,
-    set: set,
-    del: del,
-  };
-})();

scripts/build-client.mjs

@@ -31,17 +31,22 @@ if (!existsSync(SRC)) {
 }
 mkdirSync(OUT, { recursive: true });
 
-// Each top-level .ts/.tsx file in client/ is a separate entry point.
-// Sub-directories are imported by the entries via TS imports — they
-// are NOT separate entries, they get bundled into their parent.
-const entryFiles = readdirSync(SRC, { withFileTypes: true })
-  .filter(d => d.isFile() && /\.tsx?$/.test(d.name))
-  .map(d => resolve(SRC, d.name));
+// Explicit entry list — every other .ts file in client/ is a sub-module
+// imported by an entry. Add new entries here when a feature truly needs
+// its own separate bundle (different DOM lifecycle, lazy-loaded route,
+// etc.). For most modernization work, just import into main.ts.
+const ENTRIES = [
+  'main.ts',
+];
 
-if (entryFiles.length === 0) {
-  console.error(`[build-client] No .ts entry points found in ${SRC}`);
-  process.exit(1);
-}
+const entryFiles = ENTRIES.map(name => {
+  const p = resolve(SRC, name);
+  if (!existsSync(p)) {
+    console.error(`[build-client] Entry file does not exist: ${p}`);
+    process.exit(1);
+  }
+  return p;
+});
 
 const buildOpts = {
   entryPoints: entryFiles,