refactor: migrate audio metadata tagging from ts to rust

- Add id3 and metaflac crates for native audio tagging
- Create tagger.rs with separate tag_mp3() and tag_flac() functions
- Implement tag_audio_file Tauri command for unified tagging interface
- Support full metadata: title, artist, album, track#, ISRC, BPM, lyrics, cover art
- Create TypeScript wrapper (tagger.ts) for calling Rust backend
- Update downloader.ts to use Rust tagging for both MP3 and FLAC
- Remove browser-id3-writer dependency (no browser FLAC support)
- Inline lyrics parsing in addToQueue.ts (no longer needed in tagger)

src-tauri/Cargo.lock

@@ -6,6 +6,8 @@ version = 4
 name = "Shark"
 version = "0.1.0"
 dependencies = [
+ "id3",
+ "metaflac",
  "serde",
  "serde_json",
  "tauri",
@@ -1964,6 +1966,17 @@ dependencies = [
  "zerovec",
 ]
 
+[[package]]
+name = "id3"
+version = "1.16.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aadb14a5ba1a0d58ecd4a29bfc9b8f1d119eee24aa01a62c1ec93eb9630a1d86"
+dependencies = [
+ "bitflags 2.9.4",
+ "byteorder",
+ "flate2",
+]
+
 [[package]]
 name = "ident_case"
 version = "1.0.1"
@@ -2354,6 +2367,16 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "metaflac"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fdf25a3451319c52a4a56d956475fbbb763bfb8420e2187d802485cb0fd8d965"
+dependencies = [
+ "byteorder",
+ "hex",
+]
+
 [[package]]
 name = "mime"
 version = "0.3.17"