Comprehensive wiki overhaul
- Fix all .md.md filenames to .md
- Add 8 new pages: Voice-Messages-Calls, Floating-Windows, Sendspin, Quick-Entity, Screen-Control, Intent-Launcher, Mod-Store, Permissions
- Rewrite Voice-Control.md: dual engine coverage (microWakeWord + vsWakeWord), engine differences from original brownard/Ava, custom wake word guide (V3 pretrained, macOS trainer, APK injection)
- Restructure Home.md into Core / Optional / Advanced tiers
- Align terminology with actual app UI strings