chore(release): v1.42.0

Consolidates everything since v1.40.0 (public) into one coherent
release. v1.41.0 remains as an internal Draft on GitHub that was used
to verify the Cachix substituter pipeline and never went public — this
release folds its intended contents in and adds the mini-player feature
work, the player-bar time toggle (kveld9), the ReplayGain expand badge
and related UX polish on top.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Psysonic",
-  "version": "1.41.0",
+  "version": "1.42.0",
   "identifier": "dev.psysonic.player",
   "build": {
     "beforeDevCommand": "npm run dev",