fix(player): persist player prefs outside quota-bound queue blob (#958)

* fix(player): persist volume/repeat in dedicated localStorage key

Player prefs were bundled with the full queue blob in psysonic-player; after
thin-state #872 a large queue can exceed the quota and safeStorage silently
drops every write, so volume and repeat mode stopped surviving restarts.
Move them to psysonic_player_prefs, gate main-blob writes until rehydrate,
and sync volume to the Rust engine on startup.

* fix(player): split queue visibility and Last.fm cache from main persist blob

Move isQueueVisible and lastfmLovedCache to dedicated localStorage keys so
they keep saving when psysonic-player hits the quota on large queues. Include
the new keys in settings backup export.

* docs: note player prefs persist fix in CHANGELOG and credits (PR #958)

src/config/settingsCredits.ts

@@ -151,6 +151,7 @@ const CONTRIBUTOR_ENTRIES = [
       'Performance Probe: on-demand (ui) cover throughput alongside backfill (lib) cpm (PR #947)',
       'Performance Probe: throughput (analysis tpm, cover cpm) measured over a trailing 5s window so the rate reacts promptly instead of coasting on minute-long inertia (PR #948)',
       'Cover backfill: follow the smart local/public endpoint switch so off-LAN clients stop fetching covers from the unreachable local address (PR #952)',
+      'Player: persist volume/repeat/queue visibility/Last.fm cache outside quota-bound queue blob (report: norp on Psysonic Discord) (PR #958)',
     ],
   },
   {