Enable devtools in release builds + add frontend logging

- Enable Tauri devtools feature so right-click Inspect works in release
- Open devtools automatically on launch for debugging
- Add log_frontend command: frontend can write to ~/.voicetonotes/frontend.log
- Sidecar logs go to %LOCALAPPDATA%/com.voicetonotes.app/sidecar.log
- Frontend logs go to %USERPROFILE%/.voicetonotes/frontend.log

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

src-tauri/Cargo.toml

@@ -14,7 +14,7 @@ crate-type = ["staticlib", "cdylib", "rlib"]
 tauri-build = { version = "2", features = [] }
 
 [dependencies]
-tauri = { version = "2", features = ["protocol-asset"] }
+tauri = { version = "2", features = ["protocol-asset", "devtools"] }
 tauri-plugin-opener = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"