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>

screen_manager/app/core.py

@@ -18,6 +18,8 @@ ATTRS = frozenset('brightness percentage current_position current_temperature te
 
 TILE_BACKGROUNDS = {
     'auto': {'label': 'Standaard', 'color': None},
+    # No card behind the tile: contents keep their size and place on the screen background.
+    'none': {'label': 'Geen', 'color': None},
     'red': {'label': 'Rood', 'color': '#FADADD'},
     'orange': {'label': 'Oranje', 'color': '#FFE1C6'},
     'yellow': {'label': 'Geel', 'color': '#FFF0C2'},
@@ -76,6 +78,8 @@ def entity_id(value):
 
 def min_firmware(layout):
     """Oldest firmware that still accepts this layout; None when any version works."""
+    if any(t.get('options', {}).get('background') == 'none' for t in layout['tiles']):
+        return (0, 2, 16)
     if any(t['entity'].split('.')[0] in NEW_DOMAINS for t in layout['tiles']):
         return (0, 2, 14)
     if len(layout['tiles']) > 10: