chore(release): bump to 1.44.0-rc1 (#339)

CHANGELOG entry covers everything merged on top of v1.43.0:
LUFS loudness normalization, Orbit multi-user listen-together,
Now-Playing dashboard, Tracks library hub, Lucky Mix, sleep-timer
ring UI, Genres tag-cloud, queue undo/redo, settings refactor +
perf suite, plus the usual fixes.

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": "1.43.0",
+  "version": "1.44.0-rc1",
   "identifier": "dev.psysonic.player",
   "build": {
     "beforeDevCommand": "npm run dev",