feat: v0.3.0 — history, 4-button search, options page, newtab override

Web Store submission target. Mirrors rangerhq-radio's track-history pattern
(inc/history.php) so the family stays coherent across surfaces.

Highlights
- New Tab Page override (Tier 2.5) — Chrome's default new tab replaced with
  a RangerHQ-branded landing showing the player, current track, quick chips,
  searchable browse list, and now history + favourites tabs.
- Track history + favourites — capped FIFO 500, dedup against last entry,
  skip "(unknown)" artist (SomaFM dead-air). Stored in chrome.storage.local
  under tuner.history + tuner.favourites.
- 4-button search per entry — Spotify / YouTube / Apple Music / Bandcamp.
  Pure public-search-URL link-outs in a new tab, NO auth, NO API keys, NO
  quota, NO third-party SDK embedded.
- Options page (chrome://extensions → details → options) — live stats,
  history cap slider (50-500), Clear history / Clear favourites / Clear
  EVERYTHING buttons, About panel with Gitea + davidtkeane.com links.
- Popup nav row — Open in tab / History (#hash deep link) / Settings,
  using chrome.tabs.create + chrome.runtime.openOptionsPage. No new perms.
- Cross-surface sync — popup ↔ newtab listen on chrome.storage.onChanged
  for tuner.currentStationId / tuner.isPlaying / history / favourites.
- Storage gateway — offscreen doc can't reliably reach chrome.storage in
  some Chrome versions, so it sends LOG_TRACK_REQUEST to the SW which
  does the write. history.js also defensively guards every storage call.
- Metadata latency fix — polling now starts immediately on PLAY, in
  parallel with audio buffer fill. First track display drops from
  ~10-15s to ~1-2s.

Permissions unchanged
- Still ["offscreen", "storage"] + somafm.com host only.
- chrome.tabs.create works on our own extension URLs without "tabs" perm.
- No webRequest, no <all_urls>, no third-party SDK.

Bumped from 0.1.0 (last tag on Gitea) directly to 0.3.0.
v0.2.0 (newtab + clock) was a working local build but never tagged;
its features ship together with v0.3.0 in this single commit.

src/lib/messages.js

@@ -9,11 +9,15 @@ export const TARGETS = Object.freeze({
 });
 
 export const TYPES = Object.freeze({
-  PLAY:           'PLAY',
-  PAUSE:          'PAUSE',
-  SET_VOLUME:     'SET_VOLUME',
-  GET_STATE:      'GET_STATE',
-  STATE_CHANGED:  'STATE_CHANGED',
-  METADATA_UPDATED: 'METADATA_UPDATED',
-  ERROR:          'ERROR',
+  PLAY:               'PLAY',
+  PAUSE:              'PAUSE',
+  SET_VOLUME:         'SET_VOLUME',
+  GET_STATE:          'GET_STATE',
+  STATE_CHANGED:      'STATE_CHANGED',
+  METADATA_UPDATED:   'METADATA_UPDATED',
+  LOG_TRACK_REQUEST:  'LOG_TRACK_REQUEST', // offscreen → SW: please write this entry to tuner.history
+  TRACK_LOGGED:       'TRACK_LOGGED',      // SW → UI: a new entry was appended to tuner.history
+  FAVOURITE_TOGGLED:  'FAVOURITE_TOGGLED', // UI → UI: re-render any visible fav lists
+  STORAGE_WIPED:      'STORAGE_WIPED',     // options → UI: catastrophic reset, re-init from defaults
+  ERROR:              'ERROR',
 });