Backend sends rssi_current but frontend was reading net.signal || net.rssi,
causing RSSI to parse as NaN and silently skipping all meter/audio updates.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add WiFi Locate mode for locating access points by BSSID with real-time
signal meter, distance estimation, RSSI history chart, and audio
proximity tones. Includes hand-off from WiFi detail drawer, environment
presets (Free Space/Outdoor/Indoor), and signal-lost detection.
Also includes:
- Mobile navigation reorganized into labeled groups (SIG/TRK/SPC/WIFI/INTEL/SYS)
- flask-limiter made optional with graceful degradation
- Fix radiosonde setup missing semver Python dependency
- Documentation updates (FEATURES, USAGE, UI_GUIDE, GitHub Pages site)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
