feat(audio): add Opus playback via symphonia-adapter-libopus

Wire a lazy CodecRegistry built with symphonia::default::register_enabled_codecs
plus symphonia_adapter_libopus::OpusDecoder for SizedDecoder and radio decoders.

Raise package rust-version to 1.89 to match the MSRV required by
symphonia-adapter-libopus.

src-tauri/Cargo.lock

@@ -619,6 +619,15 @@ dependencies = [
  "libloading 0.8.9",
 ]
 
+[[package]]
+name = "cmake"
+version = "0.1.58"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0f78a02292a74a88ac736019ab962ece0bc380e3f977bf72e376c5d78ff0678"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "cocoa"
 version = "0.24.1"
@@ -3078,6 +3087,15 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 
+[[package]]
+name = "opusic-sys"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc3280fe5b6f97ac1a35a0ac003e2fb0b92f8e4bdf2b2057e1bf9b87acca5696"
+dependencies = [
+ "cmake",
+]
+
 [[package]]
 name = "ordered-stream"
 version = "0.2.0"
@@ -3581,6 +3599,7 @@ dependencies = [
  "serde_json",
  "souvlaki",
  "symphonia",
+ "symphonia-adapter-libopus",
  "tauri",
  "tauri-build",
  "tauri-plugin-dialog",
@@ -4739,6 +4758,17 @@ dependencies = [
  "symphonia-metadata",
 ]
 
+[[package]]
+name = "symphonia-adapter-libopus"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9d17450685dda0e87467eddf3e0f9c0b2a1707fc5c3234c111f70d46c6e4494"
+dependencies = [
+ "log",
+ "opusic-sys",
+ "symphonia-core",
+]
+
 [[package]]
 name = "symphonia-bundle-flac"
 version = "0.5.5"