AppMic v0.2.2 — 400% Gain and State Reliability

UI/state reliability release built on the v0.2.1 / Hotfix-F audio engine.

• App Volume expanded to 0–400%.
• 200% high-gain boundary and warning.
• Per-app saved gain supports the full range.
• Gain changes are smoothed.
• Saved-volume label/state fixes.
• Status display reliability improvements.
• Host/state isolation work.
• Underlying capture, adaptive-buffer, and clock-sync path intentionally preserved.