feat: queue improvements, system browser links (v1.4.5)

- Queue: year added to now-playing meta, cover enlarged to 90px + top-aligned, default width 340px
- Artist pages: Last.fm/Wikipedia open in system browser with button label feedback
- README: AUR badge + install section, Nord theme mention, in-app browser bullet removed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "psysonic",
-  "version": "1.4.4",
+  "version": "1.4.5",
   "private": true,
   "scripts": {
     "dev": "vite",