Add the Alerts cheatsheet to ESP Screens (0.2.37)

Home Assistant shows an ESPHome device action with bare field names and
types only: no description, no dropdowns. The new Alerts button opens a
reference page instead: per screen the exact action names
(esphome.<node>_show_alert and _dismiss_alert) with copy buttons and
whether the firmware is new enough, a paste-ready YAML example per
screen, every field with explanation, example and the byte limits per
board, all icons with glyph and name (searchable, tap copies), the
colour swatches, the behaviour (timeout, button, flash, standby,
replace), and the esphome.screen_alert event with an automation that
waits for the button.

core.alert_reference() carries the data and tests/test_alerts_reference.py
keeps it equal to what both board profiles, tile_palette.h,
alert_overlay.h and tile_icons.py compile. Screens carry alert_action
and dismiss_action in the inventory. App only; firmware stays 0.2.31.

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

screen_manager/app/server.py

@@ -14,7 +14,7 @@ import tile_icons
 from updates import Updater
 
 from aiohttp import ClientSession, ClientTimeout, WSMsgType, web
-from core import BUILTIN, TILE_BACKGROUNDS, controls_catalogue, discover, extras, min_firmware, pack_slots, packets, state_message, validate_layout, validate_settings
+from core import BUILTIN, TILE_BACKGROUNDS, alert_reference, alert_service, controls_catalogue, discover, extras, min_firmware, pack_slots, packets, state_message, validate_layout, validate_settings
 from zoneinfo import ZoneInfo
 
 LOG = logging.getLogger('screen_manager')
@@ -453,6 +453,8 @@ def create_app(manager, development=False):
             screen['layout'] = manager.layouts.get(screen['id'], {'title': 'Thuis', 'tiles': []})
             screen['delivery'] = manager.status.get(screen['id'], 'Kies je eerste tegels')
             screen['update'] = manager.updates.state_for(screen, profiles)
+            screen['alert_action'] = alert_service(screen.get('node'))
+            screen['dismiss_action'] = alert_service(screen.get('node'), 'dismiss_alert')
         return {'csrf': csrf, 'connected': manager.ha.online, 'screens': screens,
                 'pending': manager.pending_profiles(screens, profiles),
                 'updates': manager.updates.summary(screens, profiles)}, entities
@@ -464,6 +466,7 @@ def create_app(manager, development=False):
             payload['backgrounds'] = TILE_BACKGROUNDS
             payload['controls'] = controls_catalogue()
             payload['icons'] = tile_icons.editor()
+            payload['alerts'] = alert_reference()
             payload['builtin'] = [{'id': key, 'name': name, 'device': 'Ingebouwd op het scherm', 'area': '', 'state': 'ok'} for key, name in BUILTIN.items()]
         return web.json_response(payload)
     async def events(request):