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57774d41f3
Squash merge of feat/location-beacon-alerts-autopause (v1.21). Features: - Live Location Sharing — broadcast position as movement-gated [LOC] messages to a channel or contact; live shares show as map pins with distance/bearing in Nearby Nodes and a status-bar indicator. [LOC] is parsed in DMs, channel messages and room messages; DM shares name the sender. - Locator (geofence) — arm a geofence around a saved waypoint or a person (live [LOC] or last-known position), alert on arrive/leave or near/far, with an optional homing beeper (gated to arrive/both modes). Arm from Tools > Locator, Nearby Nodes, or Waypoints; target picker lists favourites first, clearable via a "None" entry. Active target is drawn as a flag on the map. - One active target shared across Locator / Navigate / Map via a single resolver (resolvePersonPos / activeTargetPos) that prefers a live [LOC] share over the last-advertised GPS fix. - Follow live contacts — Navigate to a live-sharing contact follows them as they move and adds an ETA line; quick-share your own position from the Map. - Map & status-bar upgrades — home mini-map gets a north marker, scale tick, and a connected trail line (was disconnected dots); status line shows tracked-node count, an arrow + distance to the active Locator/Nav target (falling back to the nearest live-tracked contact); GPS fix icon in the top status bar, shown only on GPS boards with GPS enabled. - Trail auto-pause — recording freezes on stops (banking elapsed time, breaking the map line across the idle gap) and resumes on movement without ending the session. - Streaming trail simplification — GPS points are simplified in-stream via a fixed-corridor (Reumann-Witkam) pass tuned for fidelity: straight runs collapse to their endpoints, curves stay bounded to the Min-dist tolerance, so the 512-point buffer covers a far longer route than a flat point budget would suggest. - Collapsible Tools (Location / Comms / System sections, fold-in-place like Settings) and page-indicator icons on the home carousel. - Waypoint coordinate editor — add a waypoint by scroll-editing lat/lon digit by digit. Fixes: - Critical: low-heap hang and contact loss on RAM-tight builds. Halved message-history scrollback rings (recovering ~14 KB free heap) and made contacts/channels/prefs persistence atomic (temp file + rename), so an interrupted save can no longer corrupt or wipe the store. - Serial.write() bounded so a stalled USB host can't hang the device. - Nearby Nodes: live [LOC] senders respect the type filter, sort by shared position, and the list refreshes so live shares bubble up. - Map: live contacts are labelled before waypoints. - GPS status icon hidden when GPS is off in Settings. - Splash screen no longer truncates a pre-release tag's own dash (e.g. v1.21-rc1) when stripping the build's commit-hash suffix. - Null-guarded the Locator target picker; clamped loc-share channel index on load. Under the hood: - -Os size optimisation on the e-ink and GAT562 30S solo envs. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>