Show a live picture on a camera tile, run an action from the alert button, roll long media titles, and keep full-page tiles in their own colour (0.2.91)

Live picture (issue #4): a camera or image tile on a Guition takes
Display -> Live picture with a pace of 15 or 30 s. The camera tiles of a
page share one download: the screen asks ESP Screens for them together
(esphome.screen_camera with tiles, size and bg) and the app serves one
BMP, a strip of squares with the corners rounded over each tile's own
colour; every tile draws its square out of it with LVGL's image offset
(LV_IMAGE_ALIGN_TOP_LEFT: the default centres a taller source). A third
online_image on the Guition holds the strip; it loads after the alert's
picture, a cover and the camera full screen, never under a card, in
standby or under a finger. The strip is served whole every time: ESPHome's
http_request logs a 304 as a failed request. Firmware 0.2.77.

Alert button: esp_screens_show_alert takes action and data; the app
performs the action once when the button's report (esphome.screen_alert,
ok) comes from any screen. show_alert keeps its seven fields, so every
firmware from 0.2.31 has it.

Media card and full-page media tile: a title or artist line that is too
wide rolls by (LV_LABEL_LONG_SCROLL_CIRCULAR) instead of ending in dots.

Full-page tiles are white or their own pastel like every other tile; the
tint in the state colour of firmware 0.2.62 to 0.2.76 is gone.

Host harness (27 checks) and bench Guition + local add-on on the Yellow:
docs/TEST_RESULTS_0291.md. CYD firmware 1,633,728 B, 89.0 %.

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

tests/test_editor_live.py

@@ -192,7 +192,7 @@ class Editor(unittest.TestCase):
     def test_the_mockup_polls_live_values_and_draws_them(self):
         self.assertIn('getJson(`states?${query}`)', self.store)
         self.assertIn('if (!document.hidden && state.layout && state.tab === "layout" && route.value === "") loadStates();', self.store)
-        for marker in ('liveOf(props.tile.entity)', ':class="{ lit: isOn }"', ':style="sliderStyle"', "class=\"tog\" :class=\"{ off: !on }\""):
+        for marker in ('liveOf(props.tile.entity)', 'lit: isOn', ':style="sliderStyle"', "class=\"tog\" :class=\"{ off: !on }\""):
             self.assertIn(marker, self.page, marker)
 
     def test_identify_and_the_test_alert_have_their_buttons(self):