chore: upgrade rodio 0.19 to 0.22, remove vendored rodio/cpal

Remove vendored rodio and cpal from src-tauri/vendor/ since rodio 0.22
now includes upstream f32 decoder support (our vendored modification).
Update all Cargo.toml files to use rodio 0.22 from crates.io and remove
the [patch.crates-io] section.

src-tauri/Cargo.toml

@@ -78,7 +78,7 @@ env_logger = "0.11"
 rand = "0.8"
 
 # Audio playback
-rodio = { version = "0.19", features = ["symphonia-all"] }
+rodio = { version = "0.22", features = ["symphonia-all"] }
 symphonia = { version = "0.5", features = ["all"] }
 
 # Audio visualization (FFT)
@@ -156,6 +156,3 @@ tauri-plugin-dialog = { version = "2.6.0" }
 [dev-dependencies]
 tempfile = "3"
 
-[patch.crates-io]
-cpal = { path = "vendor/cpal" }
-rodio = { path = "vendor/rodio" }