feat(tools): harden scheduler speed limiter logs

Modernize the Tools release surfaces for the cross-platform re-release checklist.

- make Speed Limiter presets unit-aware and persist custom removable quick presets

- keep diagnostic logging opt-in on clean installs and honor the saved log state on startup

- stage Scheduler enablement edits without discarding unsaved draft changes

- extend persisted settings and bindings for log opt-in and speed preset state

Verification:

- npm run build

- npm test -- --run src/store/useDownloadStore.test.ts

- cargo test --lib

- cargo test settings --lib

src/App.tsx

@@ -87,6 +87,7 @@ function App() {
   const showNotifications = useSettingsStore(state => state.showNotifications);
   const showDockBadge = useSettingsStore(state => state.showDockBadge);
   const showMenuBarIcon = useSettingsStore(state => state.showMenuBarIcon);
+  const logsEnabled = useSettingsStore(state => state.logsEnabled);
   const extensionPairingToken = useSettingsStore(state => state.extensionPairingToken);
   const downloads = useDownloadStore(state => state.downloads);
   const activeDownloadCount = downloads.filter(download => download.status === 'downloading').length;
@@ -295,6 +296,10 @@ function App() {
     invoke('toggle_tray_icon', { show: showMenuBarIcon }).catch(console.error);
   }, [showMenuBarIcon]);
 
+  useEffect(() => {
+    invoke('toggle_log_pause', { pause: !logsEnabled }).catch(console.error);
+  }, [logsEnabled]);
+
   useEffect(() => {
     if (!extensionPairingToken) return;
     invoke('set_extension_pairing_token', { token: extensionPairingToken }).catch(error => {