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.

manifest.json

@@ -1,8 +1,8 @@
 {
   "manifest_version": 3,
   "name": "RangerHQ Tuner",
-  "version": "0.1.0",
-  "description": "Lightweight indie internet radio player. Starts with SomaFM, extensible to more networks.",
+  "version": "0.3.0",
+  "description": "Lightweight indie internet radio player. Plays SomaFM in your toolbar, logs the tracks you hear, and gives you one-click search links to Spotify, YouTube, Apple Music, and Bandcamp. No telemetry.",
   "author": "David Keane",
   "homepage_url": "https://davidtkeane.com/rangerhq-tuner",
   "icons": {
@@ -23,6 +23,10 @@
     "service_worker": "src/background/service-worker.js",
     "type": "module"
   },
+  "chrome_url_overrides": {
+    "newtab": "src/newtab/newtab.html"
+  },
+  "options_page": "src/options/options.html",
   "permissions": ["offscreen", "storage"],
   "host_permissions": [
     "https://somafm.com/*",