feat(v0.5.3-prep): user-customizable Quick Stations + descriptions

David flagged 2026-06-10: '14 stations wraps 3 lines, original idea
was 2 lines tidy, but now thought of user selecting themselves' +
'maybe have a description of each station' + 'be great to keep the
code clean.'

Architecture: pure data, not code. Adds tuner.quickStations as a
new chrome.storage.local key. Default 8 (tidy 2-row layout per the
v0.4.0 picks). User can pick any subset of the 46 SomaFM channels
via a new Options page card.

NEW FILE
  src/lib/quick-stations.js — DEFAULT_QUICK_IDS + storage helpers
  (getQuickStations, setQuickStations, resetQuickStations) with the
  same defensive 'fall back if chrome.storage missing' pattern as
  history.js + theme.js.

CHANGED
  src/newtab/newtab.js — removed hardcoded QUICK_IDS array, replaced
  with module-level 'let quickIds = []' populated during init from
  getQuickStations() + re-loaded when chrome.storage.onChanged fires
  on tuner.quickStations. renderQuick() now uses module-level
  quickIds and shows 'No Quick Stations picked — set some in
  Settings' empty state if the array is empty.

  src/options/options.html — new 'Quick Stations' card between
  Appearance and Playback. Contains: helper text + selected-count
  badge + scrollable <ul> + Reset-to-defaults button.

  src/options/options.css — ~90 lines for the new picker: scrollable
  list (max-height 360px), checkbox-name-description row layout,
  accent-coloured count badge, subtle hover background, brand-styled
  scrollbar.

  src/options/options.js — initQuickStationsUI() reads cached
  channel list from tuner.stationsCache, sorts alphabetically, builds
  one row per channel with checkbox + name + genre pill + description.
  Toggle handler writes the current pick set to chrome.storage.local.
  Reset button confirms then calls resetQuickStations() + re-checks
  boxes to match defaults. Cross-surface sync via storage.onChanged
  re-syncs check state if changes happen elsewhere.

5 files (1 new), ~250 lines added. No new permissions, no new
dependencies.

src/options/options.css

@@ -367,3 +367,100 @@ html, body {
   background: var(--danger);
   color: var(--cream);
 }
+
+/* ──────────────────────────────────────────────────────────────────────
+   Quick Stations picker (v0.5.3) — scrollable checkbox list of every
+   SomaFM channel. Toggles persist to chrome.storage.local under
+   tuner.quickStations; NewTab re-renders chip row instantly.
+   ────────────────────────────────────────────────────────────────────── */
+
+.opt-qs-count {
+  color: var(--accent);
+  font-weight: 500;
+}
+
+.opt-qs-list {
+  margin: 12px 0 0;
+  padding: 0;
+  list-style: none;
+  max-height: 360px;
+  overflow-y: auto;
+  border: 1px solid var(--bg-row);
+  border-radius: var(--radius);
+  background: var(--bg-row);
+}
+
+.opt-qs-list::-webkit-scrollbar {
+  width: 8px;
+}
+.opt-qs-list::-webkit-scrollbar-thumb {
+  background: var(--bg-row-hi);
+  border-radius: 4px;
+}
+.opt-qs-list::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.opt-qs-loading {
+  padding: 14px;
+  text-align: center;
+  color: var(--fg-muted);
+  font-size: 12px;
+}
+
+.opt-qs-row {
+  border-bottom: 1px solid var(--bg-soft);
+}
+
+.opt-qs-row:last-child {
+  border-bottom: none;
+}
+
+.opt-qs-label {
+  display: flex;
+  align-items: flex-start;
+  gap: 12px;
+  padding: 10px 14px;
+  margin: 0;
+  cursor: pointer;
+  font-weight: 400;
+}
+
+.opt-qs-label:hover {
+  background: var(--bg-row-hi);
+}
+
+.opt-qs-label input[type="checkbox"] {
+  margin: 3px 0 0 0;
+  accent-color: var(--accent);
+  flex-shrink: 0;
+  width: 14px;
+  height: 14px;
+  cursor: pointer;
+}
+
+.opt-qs-main {
+  flex: 1;
+  min-width: 0;
+}
+
+.opt-qs-name {
+  font-size: 13px;
+  font-weight: 500;
+  color: var(--fg);
+}
+
+.opt-qs-genre {
+  font-size: 10px;
+  color: var(--accent);
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  margin-top: 2px;
+}
+
+.opt-qs-desc {
+  font-size: 11px;
+  color: var(--fg-muted);
+  margin-top: 3px;
+  line-height: 1.4;
+}