v1.2.0 — Far-distance tracking, 🤟 mode-switch, robust draw-mode pen

v1.2.0 — Far-distance tracking, 🤟 mode-switch, robust draw-mode pen

✨ New features

• Far-distance hand tracking — crop-zoom super-resolution, One Euro smoothing, and active-region mapping reliably track hands at greater distances.
• 🤟 New mode-switch gesture — hold a single-hand "I Love You" sign to switch modes (replaces the previous mode-switch gesture).
• Side-view-robust pen control in drawing mode — stable writing even when the camera sees the hand from the side or up close.
• Crash logging — native / thread / Qt crashes are now captured to crash.log.
• Raw-video record + offline replay harness — record raw footage and replay it offline for objective detection A/B testing.

🐛 Fixes

• Zoom viewport now locks to the top hand and snaps on engage — stops the mid-distance "bellows" oscillation.
• Strokes no longer break from unreliable thumb / geometry signals at side view.
• Completed the central voting pen state machine in draw mode.
• Fixed two-finger hover false positives that caused severe stroke breaking.

🔧 Internal

• Decoupled the floating-window UI from service orchestration via a new AirControlOrchestrator.
• Cleaned up redundant / broken install & startup scripts; added tests (dictation, replay, swipe distance, zoom SR).

Full changelog: v1.1.0...v1.2.0