AppMic v0.2.3 — High-Gain UX and Reset Fixes

Refines the 0–400% volume behavior without changing the stable audio engine.

• Removes the problematic double-click volume reset.
• Adds a dedicated Reset button that returns App Volume to 100%.
• Reworks >200% warning/authorization behavior.
• Keeps the slider blue at exactly 200% when high gain is declined.
• Keeps accepted high gain authorized for the current panel session.
• Preserves the v0.2.1 / Hotfix-F capture, synchronization, limiter, and mic-mix path.