feat(node): add GPX export to position log screen#5919
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Adds a GPX 1.1 export button to PositionLogScreen alongside the existing
CSV export. The local node's own track is already available there via
NodeMapViewModel's MeshLog.NODE_NUM_LOCAL routing — no new map overlay
needed. buildGpx() uses kotlinx-datetime Instant for UTC timestamps and
formatString("%.7f", ...) to avoid scientific notation in xs:decimal attrs.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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PositionLogScreenalready displays position history for any node, including the local device (viaNodeMapViewModel'sMeshLog.NODE_NUM_LOCALrouting). The only missing piece was GPX export. This adds it as a second export button alongside the existing CSV export, with no new screens, view models, or map overlays.🌟 New Features
FileDownloadicon) onPositionLogScreen, gated onpositions.isNotEmpty()savePositionGpx(uri, data, trackName)onMetricsViewModelmirroring the existingsavePositionCSVpatternbuildGpx()emits valid GPX 1.1 with<trkpt lat lon>, optional<ele>, and<time>(ISO-8601 UTC viakotlinx-datetime); coordinates formatted withformatString("%.7f", …)to avoid scientific notation inxs:decimalattributes; positions withtime <= 0are skipped🧹 Chores
export_gpxstring resource