Diane v0.5.1

Fix playback on fresh installs / other machines.

Fixes:

• Default tape audio now bundles correctly in the .app (was at wrong path in Resources)
• resolve_default_audio searches 7+ candidate paths for maximum compatibility
• Logs all searched paths when WAV not found for easier debugging
• Frontend no longer saves literal "DEFAULT" as audio path on resolve failure

macOS (Apple Silicon) — Signed & Notarized