Add Linux desktop file for Rofi launching

Launches Blurt via `uv run --project`, which resolves the project/venv
without altering cwd. Blurt anchors all config to the script location,
so no working-directory change is needed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

blurt.desktop

@@ -0,0 +1,11 @@
+[Desktop Entry]
+Type=Application
+Name=Blurt
+GenericName=Voice-to-Text
+Comment=Tray-based push-to-talk voice-to-text
+Exec=uv run --project /home/felixm/dev/blurt blurt
+Icon=audio-input-microphone
+Terminal=false
+Categories=Utility;AudioVideo;Audio;
+Keywords=voice;transcribe;dictation;speech;clipboard;
+StartupNotify=false