* 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)
cucadmuh