docs(privacy): add tuner.theme + tuner.quickStations to storage key list

Effective date bumped 2026-06-09 → 2026-06-10. Two new storage keys
added by v0.5.0 + v0.5.3 are now documented:

- tuner.theme — user's chosen theme preference (auto/dark/light)
- tuner.quickStations — user's Quick Stations picks

Neither key changes the privacy story (still all local, still no
data transmitted). Just keeping the per-key inventory honest.

The davidtkeane.com privacy.html mirror has the same edits and
will be uploaded separately by David.

PRIVACY.md

@@ -1,6 +1,6 @@
 # Privacy Policy — RangerHQ Tuner
 
-**Effective date:** 2026-06-09
+**Effective date:** 2026-06-10
 **Maintainer:** David Keane — <david@davidtkeane.com>
 **Extension homepage:** https://davidtkeane.com/rangerhq-tuner
 **Source code:** https://git.davidtkeane.com/ranger/rangerhq-tuner
@@ -49,6 +49,8 @@ RangerHQ Tuner uses Chrome's `chrome.storage.local` API to persist a small amoun
 | `tuner.history` | A capped log of artist + title pairs heard while playing | The History tab on the New Tab Page |
 | `tuner.favourites` | Track entries you have starred | The Favourites tab |
 | `tuner.historyCap` | Your chosen history-cap value (default 500) | Configurable on the Options page |
+| `tuner.theme` | Your theme preference (`auto` / `dark` / `light`) | Configurable on the Options page; default `auto` follows OS |
+| `tuner.quickStations` | The SomaFM channel short IDs you chose to surface in the New Tab Page Quick Stations row | Configurable on the Options page; default is a curated 8 |
 
 The history and favourites entries contain: artist name, track title, station display name, station ID, and a local timestamp. **They are stored in your browser only.** They are never sent to the extension author or any third party.