v0.2.3: Run without console window on Windows

- Add windows_subsystem = "windows" to prevent console window on double-click
- Use AttachConsole(ATTACH_PARENT_PROCESS) so CLI subcommands still work from a terminal
- Show MessageBoxW error dialog if daemon fails to start
- Remove hide_console() (now unnecessary)
- Fix unused import warning in ipc.rs (warn → tracing::warn! inline)

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

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mouth"
-version = "0.2.2"
+version = "0.2.3"
 edition = "2024"
 description = "Offline speech-to-text with global hotkey and paste"
 license-file = "LICENSE"