feat(l2): long trails with a card copy; map follow and redraw fixes

Trail on the L2: 32768 points every 5 m, no simplification, no point
spacing setting; copied to the card every minute and restored at power-on.
The line keeps up with the position dot (incremental sync, pending point).

Map: a tap's finger jitter no longer turns follow off; the GPS button
shows when the map follows. The trail is drawn as one polyline with
breaks and off-view chunks skipped (an lv_line queued a draw task per
point).

Fewer rebuilds: conversation bubbles patched (new messages, delivery
marks), home mini-map dots reused, Nearby rows rewritten in place,
history read in runs and each file opened once.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/solo/navigation.md

@@ -36,7 +36,11 @@ Chrome or Edge and click **Connect device**, then on the device choose
 it's connected over USB.
 
 > [!NOTE]
-> **Wio Tracker L2:** the trail holds 4096 points and is drawn on the map.
+> **Wio Tracker L2:** the trail holds 32,768 points, every GPS fix 5 m or
+> more from the last one (no simplification and no Min dist setting), about
+> 160 km on foot. A copy on the SD card is updated every minute, so a restart
+> or a flat battery doesn't lose it: the trail comes back at power-on, still
+> recording if it was. It is drawn on the map and keeps up with your position.
 > Its controls (start / stop, save, load, track back, reset) are in the map's
 > **Map tools**, the settings in Settings › Map. **GPX** writes the trail to
 > `trails/` on the SD card; take it off with the card as a USB drive