* feat(geohash): add in-app Geohash Picker map with quadrant drill-down and Activity integration
- New GeohashPickerActivity hosting a WebView with Leaflet-based picker
- Adds map icon next to custom geohash input in LocationChannelsSheet
- Picker allows quadrant selection and subquadrant drill-down; returns selected geohash
- Register activity in AndroidManifest
perf(picker): improve map performance and correctness
- Use LayerGroup and clearLayers() on redraw to avoid stale overlays
- Use Leaflet canvas renderer for rectangles to reduce DOM and improve perf
- Make labels non-interactive and pointer-events: none to avoid gesture overhead
- Fix initial mega-label artifact by grouping and clearing labels with cells
chore: add asset geohash_picker.html with minimal geohash helpers (bounds/encode/adjacent)
* remove accidentally committed submodule.
* fix some issues
* better geohash labels on map
* design wip
* countries green
* wip
* geohashpicker: pan + zoom; start from current geohash channel
* better ui
* ui elements
* nice
* readability
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Co-authored-by: callebtc <93376500+callebtc@users.noreply.github.com>
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