Add a card for blinds and curtains, and fix what Studio 1 showed after 0.2.57 (0.2.58)

A tap on a cover now opens a card like Home Assistant's own, in the style
of the climate and vacuum cards: a tall position slider on which the blind
hangs from the top, a tilt slider over slats for venetian blinds, and open,
stop and close keys. The key of the direction the cover moves is filled; a
key that cannot move it further is disabled and stays out of the keys the
card's tick enables. Sliders show their value while dragged and send it on
release. The card offers only what supported_features allows. A
battery-powered blind shows its battery at the top right: the app sends
the device's battery sensor as the extra the vacuum card uses, and adds
current_tilt_position to the attributes.

Checking Studio 1 after its update to firmware 0.2.49 found that a setting
number equal to its initial state 0 (night brightness 0 %) was never
published, so Home Assistant kept it unknown and ESP Screens could not
change it; apply_screen_settings now publishes a number without a state.
The app also took "unavailable" for the device name during the restart
and wrote sensor.esp_screens_unavailable; diagnostics ignore unknown and
unavailable. The editor redraws its tiles, top bar and entity list when
the live stream opened a screen before the first full inventory (a busy
add-on), and loads app.js and style.css by content stamp after Safari kept
an old script.

Checked with 254 Python and 14 C++ tests, generate_packages --check, ESP32
builds of both profiles, and 20 API checks of the card on host builds of
both boards. Firmware 0.2.50.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/test_editor_startup.py

@@ -0,0 +1,38 @@
+"""Opening ESP Screens while the add-on is busy (app 0.2.58).
+
+The page asks for the full inventory and opens the live stream at the same time. An add-on that is building
+firmware answers the stream first, whose light payload has screens but no entities, so the first screen was
+opened with an empty catalogue: the entity list said "No entities found" and the tiles showed entity ids until
+a filter chip was pressed. The first full inventory now draws those parts again.
+"""
+import re
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+SCRIPT = (ROOT / 'screen_manager/app/static/app.js').read_text()
+
+
+def function(name):
+    start = SCRIPT.index(f'function {name}(')
+    return SCRIPT[start:SCRIPT.index('\n}\n', start)]
+
+
+class Startup(unittest.TestCase):
+    def test_the_live_stream_can_open_a_screen_before_the_catalogue(self):
+        # The race exists: the light payload selects the first screen, and it carries no entities.
+        self.assertIn('if (!selected && inventory.screens.length) select(inventory.screens[0].id);', function('applyLive'))
+        self.assertRegex(function('select'), r'renderTopbar\(\);\s+renderTiles\(\);\s+renderResults\(\);')
+
+    def test_the_first_full_inventory_draws_what_needs_entities_again(self):
+        body = function('refresh')
+        first = body.index('const firstCatalogue = full && !inventory.entities?.length;')
+        self.assertLess(first, body.index('inventory = full ? data'), 'decided before the catalogue is replaced')
+        redraw = re.search(r'if \(firstCatalogue && selected && layout && !drag\.active && !chipDrag\.active\) '
+                           r'\{ renderTopbar\(\); renderTiles\(\); renderResults\(\); \}', body)
+        self.assertTrue(redraw, 'tiles, top bar and entity list are drawn again, never in the middle of a drag')
+        self.assertLess(redraw.start(), body.index('if (!selected && inventory.screens.length) select('))
+
+
+if __name__ == '__main__':
+    unittest.main()