Calendar analog clock with ticks and numerals; tiles without background

Firmware 0.2.16: the analog clock uses index strokes with 12/3/6/9
numerals on large cards and shows a calendar block (weekday, big day,
short month) beside the dial on single tiles; wide cards keep the digital
time and date. New palette key 'none' hides only the card fill and
border: geometry, padding and the pressed flash stay identical. Skeleton
frames and the render self-test honour the transparency.

App 0.2.15: 'Geen' in the background palette with a dashed mockup tile,
min_firmware 0.2.16 for such layouts, demo layout with the bare calendar
clock (--wide for the double-width clock). README and AGENTS note that
every push is a release and bumps the add-on version.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

components/smart_display/runtime_model.h

@@ -49,6 +49,7 @@ struct Tile {
   uint32_t timer_end = 0;
   float battery = NAN, volume = NAN;
   uint32_t supported = 0, background = 0;
+  bool transparent = false;  // "Achtergrond: geen": card fill and border hidden, contents unchanged.
   std::string revision, pending_revision;
   uint32_t pending_since = 0;
   bool pending = false, confirmed = false, local_feedback = false;