fix: font switching, layout scaling, embedded lyrics, folder opening

- fix(fonts): update CSS var declarations to @fontsource-variable naming
  ('Inter Variable', 'Outfit Variable', etc.) so dynamic font switching works
- fix(layout): 100vh → 100% on .app-shell to fix Windows WebView2 playerbar drift;
  1fr → minmax(0,1fr) in all grid-template-rows + remove min-height: 720px to fix
  Linux playerbar disappearing at high zoom or small window sizes
- fix(updater): replace shell open() with Rust open_folder command to bypass
  shell:allow-open capability scope blocking local paths on Windows
- fix(lyrics): add get_embedded_lyrics Tauri command (id3 crate for MP3 SYLT/USLT,
  lofty for FLAC SYNCEDLYRICS/LYRICS); fix parseLrc regex for LRC without fractional
  seconds; fix SubsonicStructuredLyrics to accept both synced and issynced fields

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

src-tauri/Cargo.lock

@@ -907,6 +907,12 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c87e182de0887fd5361989c677c4e8f5000cd9491d6d563161a8f3a5519fc7f"
 
+[[package]]
+name = "data-encoding"
+version = "2.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7a1e2f27636f116493b8b860f5546edb47c8d8f8ea73e1d2a20be88e28d1fea"
+
 [[package]]
 name = "deranged"
 version = "0.5.8"
@@ -2058,6 +2064,17 @@ version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d3067d79b975e8844ca9eb072e16b31c3c1c36928edf9c6789548c524d0d954"
 
+[[package]]
+name = "id3"
+version = "1.16.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "965c5e6a62a241f2f673df956ea5f52c27780bc1031855890a551ed9b869e2d1"
+dependencies = [
+ "bitflags 2.11.0",
+ "byteorder",
+ "flate2",
+]
+
 [[package]]
 name = "ident_case"
 version = "1.0.1"
@@ -2420,6 +2437,32 @@ dependencies = [
  "scopeguard",
 ]
 
+[[package]]
+name = "lofty"
+version = "0.22.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca260c51a9c71f823fbfd2e6fbc8eb2ee09834b98c00763d877ca8bfa85cde3e"
+dependencies = [
+ "byteorder",
+ "data-encoding",
+ "flate2",
+ "lofty_attr",
+ "log",
+ "ogg_pager",
+ "paste",
+]
+
+[[package]]
+name = "lofty_attr"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed9983e64b2358522f745c1251924e3ab7252d55637e80f6a0a3de642d6a9efc"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "log"
 version = "0.4.29"
@@ -2881,6 +2924,15 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "ogg_pager"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d6d1ca8364b84e0cf725eed06b1460c44671e6c0fb28765f5262de3ece07fdc"
+dependencies = [
+ "byteorder",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.21.3"
@@ -2979,6 +3031,12 @@ dependencies = [
  "windows-link 0.2.1",
 ]
 
+[[package]]
+name = "paste"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
+
 [[package]]
 name = "pathdiff"
 version = "0.2.3"
@@ -3344,6 +3402,8 @@ dependencies = [
  "biquad",
  "discord-rich-presence",
  "futures-util",
+ "id3",
+ "lofty",
  "md5",
  "reqwest 0.12.28",
  "ringbuf",