torlando-tech cff41d4fa0 Add offline map display and Sideband-compatible telemetry location sharing ...

- LVGL PNG decoder (lodepng) + SD card filesystem driver for loading OSM tiles
- MapScreen with 2x2 tile grid, GPS marker, peer location markers, pan/zoom
- 5th nav button (GPS icon) on conversation list for map access
- TelemetryCodec: Sideband/Columba-compatible LXMF telemetry encode/decode
- TelemetryManager: per-peer sharing sessions with duration/expiry, SPIFFS persistence
- ChatScreen location share button with duration picker (15min/1hr/4hr/indefinite)
- UIManager integration: telemetry send/receive via LXMF fields, map marker updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-04 21:05:28 -05:00

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