feat(l2): Gallery app (screenshots as thumbnails, full view with swipe and delete, the saved trails), the clock from NTP while WiFi is up (the router's server from DHCP first), tabs switch on release, Home apps out of Settings

- Gallery: thumbnails 30 to a page, built only while the screen is still (a decode held the loop and a scroll read as a tap)
- segmented(): CLICK_TRIG, so a swipe starting on a screen's tabs doesn't switch them
- Settings > Device > Home apps removed (hold an app on Home instead)
- platformio.ini: a note that the L2 has no microphone on GPIO15 (verified on hardware)

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

docs/solo/settings.md

@@ -99,10 +99,9 @@ if your mesh agrees on it.
 > **Wio Tracker L2:** one list of pages:
 >
 > - **Device**: Display (including the lock, **Tap to wake**, the **Theme**,
->   dark or light, which restarts the device, and the accent colour), Home apps,
->   Power (battery, GPS, and the **Battery curve** as a chart whose points you
->   drag), Sound (with the melody editor), Keyboard, Messages
->   & contacts.
+>   dark or light, which restarts the device, and the accent colour), Power
+>   (battery, GPS, and the **Battery curve** as a chart whose points you
+>   drag), Sound (with the melody editor), Keyboard, Messages & contacts.
 > - **Connections**: Radio (with **Advanced** at the bottom), Privacy,
 >   Bluetooth, WiFi, GPS. Adding contacts is in Messages & contacts.
 > - **Map & data**: Map (trail, live sharing and arrival alert options),