Fix MPRIS player duplication during internet radio (#1048) (#1069)

* fix(mpris): disable WebKit media session so radio doesn't duplicate the player

Internet radio plays through an HTML <audio> element, for which WebKitGTK
auto-registers its own MPRIS player (org.webkit.*) alongside the app's
souvlaki one. On Linux desktops that list every player, now-playing then
showed twice during radio (issue #1048: one "psysonic", one "Psysonic").

Disable the WebKit media session at main-window setup (enable-media-session,
set by GObject property name since the pinned binding has no typed setter,
guarded by find_property) so souvlaki stays the single now-playing source;
radio metadata still reaches it via mpris_set_metadata. The navigator.media
Session push in useRadioMprisSync is kept as a fallback in case a WebKitGTK
version still registers the player, so issue #816 cannot regress.

* docs(changelog): MPRIS radio duplication fix (PR #1069)

src-tauri/src/lib_commands/app_api/mod.rs

@@ -27,7 +27,8 @@ pub(crate) use platform::{
 };
 #[cfg(target_os = "linux")]
 pub(crate) use platform::{
-    linux_webkit_apply_wayland_gpu_font_tuning, linux_webkit_reapply_cached_wayland_text_render_profile,
+    linux_webkit_apply_wayland_gpu_font_tuning, linux_webkit_disable_media_session,
+    linux_webkit_reapply_cached_wayland_text_render_profile,
     sync_wayland_text_profile_cache_from_disk,
 };
 pub(crate) use integration::{