Tidy the standby code around Wake and Sleep (0.2.54)

One rule ends a Sleep: a tap, Wake or an alert. The Auto standby switch
cleared sleep_requested when Home Assistant turned standby off, while
ESP Screens and the settings page on the screen did not; now only
wake_display clears the flag, and apply_screen_settings still wakes a
screen the standby time dimmed.

dim_display no longer checks anything itself (the interval checks Auto
standby, the Sleep button sets the flag). It dims, then runs go_home with
"also on standby" on, otherwise closes the settings page and every card
through close_cards. Before, it copied half of go_home and hid the four
YAML overlays itself, so a runtime detail card stayed open under a dimmed
screen. close_cards is now the one runtime_tiles::dismiss() call: the
fallback and the widget.hide actions after its return ran for nothing.

The backlight light becomes internal. Home Assistant could change it, but
the minute tick put the level back, and switching it off darkened the
screen without standby. The brightness numbers and Wake/Sleep replace it.
A dead clock-label branch from the manual profile leaves
apply_screen_settings.

Checked with 209 Python and 14 C++ tests, host builds of both boards over
the native API, and ESP32 builds of both Easy profiles. Firmware 0.2.46.

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

docs/TEST_RESULTS_0254.md

@@ -0,0 +1,51 @@
+# Test results app 0.2.54 / firmware 0.2.46 (2026-09-16)
+
+The standby code tidied after a review of Wake and Sleep: one rule for ending a Sleep, standby through
+`go_home` / `close_cards`, `close_cards` as one call, the backlight light internal, and a dead
+manual-profile branch removed. Storage, tile protocol, preferences and keys are unchanged. See
+CHANGELOG 0.2.54 and the compatibility note in docs/RELEASING.md.
+
+## Automated
+
+- Python (`.venv-portal`): 209 tests OK. `tests/test_wake_sleep.py` now has 9 tests, run against both
+  board profiles and both generated packages. New: `dim_display` sets `display_dimmed`, runs
+  `apply_screen_settings` and then `go_home` or `settings_screen::close()` + `close_cards`, with no
+  overlay hiding of its own; it has exactly two callers, and the standby interval only calls it with
+  Auto standby on. `close_cards` is the single `runtime_tiles::dismiss()` call, and that callback
+  hides the detail card, clears `active_entity` and hides the four overlays. `sleep_requested` is
+  cleared in exactly one place (`wake_display`) and the Auto standby switch no longer mentions it.
+  The `back_light` light is `internal: true`.
+- C++ (`clang++ -std=c++17 -Wall -Wextra -Werror -I.`): 14/14 PASS (no C++ changed).
+- `generate_packages.py --check` green.
+- Home Assistant (read-only `search/related`): no automation, script or scene uses
+  `light.studio_1_display_backlight`, the only backlight light in Max's Home Assistant.
+
+## Builds (ESPHome 2026.6.2)
+
+Both Easy Setup profiles, compiled one after the other from packages generated out of the board profiles:
+
+| Profile | RAM | Flash | vs 0.2.53 |
+|---|---|---|---|
+| easy-cyd-device.yaml (package, local components) | 23.0% (75,468 B) | 76.1% (1,395,683 B) | -144 B RAM, -744 B flash |
+| easy-guition-device.yaml (package, local components) | 24.0% (78,692 B) | 18.4% (1,495,307 B) | -152 B RAM, -764 B flash |
+
+## Behaviour on the real profile logic (host build)
+
+Same route as 0.2.53: the generated packages built for the Mac with ESPHome's host platform and driven
+over the native API, now with the probe also reporting the settings page, the climate overlay and
+`active_entity`, plus test-only actions that open a card and flip "also on standby". Result: 35/35 checks passed on the Guition package and 35/35 on the CYD package (the CYD still lists its RGB `LED` light, as intended).
+
+Checked on both boards, besides everything from 0.2.53:
+
+1. The backlight light is not among the entities Home Assistant gets.
+2. With "also on standby" on and off: Sleep closes an open settings page and an open card (overlay
+   hidden, `active_entity` empty); the standby time closes an open card too.
+3. The standby time dims with Auto standby on; switching Auto standby off wakes that screen.
+4. Sleep, then switching Auto standby from on to off: the screen stays asleep at the standby level;
+   a tap on the overlay wakes it.
+
+## Not tested / for the owner
+
+- Hardware. Nothing was flashed: the bench boards (192.168.146.134 / .136) were unreachable, and Studio 1
+  was busy with another session's touch log over USB. On real glass after the update: Sleep with a card
+  open, and whether Home Assistant shows the old backlight light as unavailable (delete it there).