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>

examples/companion_radio/ui-lvgl/Widgets.h

@@ -957,11 +957,14 @@ static int32_t s_settings_y = 0;                    // Settings' scroll, kept wh
 // A one-of-N choice: a row (or grid, with "\n" in the map) of checkable
 // buttons, `sel` checked (-1: none). `item` is the unchecked button colour —
 // SURFACE on a SURFACE_2 panel, SURFACE_2 on the page.
+// Picked on release over the same button (CLICK_TRIG), not on press as
+// lv_buttonmatrix does by default: a swipe starting on a screen's tabs (to
+// scroll the list under them back up) switched the tab.
 static lv_obj_t* segmented(lv_obj_t* parent, const char** map, int sel, int w, int h,
                            uint32_t item = theme::SURFACE_2) {
   lv_obj_t* m = lv_buttonmatrix_create(parent);
   lv_buttonmatrix_set_map(m, map);
-  lv_buttonmatrix_set_button_ctrl_all(m, LV_BUTTONMATRIX_CTRL_CHECKABLE);
+  lv_buttonmatrix_set_button_ctrl_all(m, (lv_buttonmatrix_ctrl_t)(LV_BUTTONMATRIX_CTRL_CHECKABLE | LV_BUTTONMATRIX_CTRL_CLICK_TRIG));
   lv_buttonmatrix_set_one_checked(m, true);
   if (sel >= 0) lv_buttonmatrix_set_button_ctrl(m, sel, LV_BUTTONMATRIX_CTRL_CHECKED);
   lv_obj_set_size(m, w, h);