Tags: projectM-visualizer/frontend-qt

Fix heap corruption crash with thread-safe audio buffering

- Move all projectM calls to render thread to eliminate race condition
- Add audio ring buffer to QProjectMWidget for thread-safe queueing
- Audio thread now just writes to buffer, render thread processes it
- Add 'R' hotkey for random preset selection
- Fixes 'malloc(): unsorted double linked list corrupted' crash

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Keyboard shortcuts and UI fixes

PipeWire visualization working with Wayland support