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/lib/quick-stations.js

@@ -0,0 +1,58 @@
+// RangerHQ Tuner — Quick Stations preference helpers (v0.5.3).
+//
+// The user picks which SomaFM channels appear in the Quick Stations chip
+// row on the New Tab Page. Stored in chrome.storage.local under
+// `tuner.quickStations` as an array of SomaFM short ids
+// (e.g. ['groovesalad', 'defcon', ...]). If the key is missing, the
+// DEFAULT_QUICK_IDS below are used — a tidy 8 that wraps to 2 rows on
+// most viewports.
+//
+// Cross-surface sync: NewTab's `chrome.storage.onChanged` listener picks
+// up changes so toggling a checkbox in Options re-renders the chip row
+// instantly without a reload.
+
+export const QUICK_STATIONS_KEY = 'tuner.quickStations';
+
+// 8 curated defaults — the same set Tuner v0.4.0 shipped with. Chosen
+// for genre breadth (chill / ambient / indie / lounge / space / vocal /
+// ambient / electronic) and to fit a tidy 2-row chip layout.
+export const DEFAULT_QUICK_IDS = Object.freeze([
+  'groovesalad',
+  'dronezone',
+  'indiepop',
+  'secretagent',
+  'spacestation',
+  'lush',
+  'deepspaceone',
+  'fluid',
+]);
+
+function storage() {
+  if (typeof chrome === 'undefined') return null;
+  if (!chrome.storage || !chrome.storage.local) return null;
+  return chrome.storage.local;
+}
+
+/** Read the user's chosen quick-station list, falling back to defaults. */
+export async function getQuickStations() {
+  const s = storage();
+  if (!s) return [...DEFAULT_QUICK_IDS];
+  const o = await s.get(QUICK_STATIONS_KEY);
+  const v = o[QUICK_STATIONS_KEY];
+  return Array.isArray(v) ? v.filter(x => typeof x === 'string') : [...DEFAULT_QUICK_IDS];
+}
+
+/** Persist the user's chosen quick-station list. Empty array = no quick chips. */
+export async function setQuickStations(ids) {
+  const s = storage();
+  if (!s) return;
+  const arr = Array.isArray(ids) ? ids.filter(x => typeof x === 'string') : [];
+  await s.set({ [QUICK_STATIONS_KEY]: arr });
+}
+
+/** Wipe the preference so the default-8 is used again. */
+export async function resetQuickStations() {
+  const s = storage();
+  if (!s) return;
+  await s.remove(QUICK_STATIONS_KEY);
+}