v0.1.1-alpha.5

Fixes

• Critical: audio xruns on EQ changes — Removed RwLock from the real-time audio thread. EQ processing now runs entirely on the PipeWire mainloop thread with zero lock acquisitions.
• Critical: TUI hangs on event thread failure — Event thread no longer panics silently when the channel drops. Exits cleanly instead of freezing the TUI.
• UX: zero-value cell editing — Entering insert mode on a frequency/gain/Q cell at 0 now starts with an empty input field. No more deleting "0.0" before typing a new value.

Performance

• Preamp folded into EQ processing — Preamp multiplication is now applied inside the biquad chain's output pass, eliminating one full buffer traversal per audio callback.
• Peak detection loop merged — Left and right channel peak scanning combined into a single pass.

Internal

• Removed EffectPlugin trait (single implementation, no longer needed)
• Pipeline::set_bands() removed — EQ config flows through the command channel
• 0 new dependencies

Full Changelog: v0.1.1-alpha.4...v0.1.1-alpha.5