Change a screen's settings on the screen itself (0.2.52)

Holding the top bar for about a second and a half opens a settings page on the
screen, with a blue line filling along the top edge while you hold. A built-in
screen.settings tile and the esphome.<screen>_open_settings action open it too.

The page is one constexpr table of rows in settings_screen.h: Brightness,
Night, Screen (clock, back to page 1, swiping, rotation) and This screen (name,
address, firmware, Home Assistant, Restart). Toggles flip on a tap, numbers and
times step with -/+ (a held time walks whole hours), a choice cycles in a chip,
and a row that depends on a switch above it is greyed out. The LVGL objects exist
only while the page is open: +608 bytes of RAM and +10.7 KB of flash on the CYD.
A change is saved, applied and reported through the existing screen_setting
event, so ESP Screens shows the same value within a second.

New setting auto_home (default on, 2 minutes): an open card, the settings page
or a later page goes back to page 1 after that long without a touch, not only on
standby. It travels beside the frozen eleven-key settings block with its own
preference, so older firmware and older apps keep working.

docs/SETTINGS.md is the recipe for adding a setting; the Claude skill explains
the page. Firmware 0.2.44.

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

AGENTS.md

@@ -49,6 +49,10 @@ physically tap; an agent cannot replace that with software coordinates.
 
 - Keep base hardware and UI in `home-like-2432s028.yaml`; personal data belongs
   in the gitignored local profiles.
+- Screen settings live in one table: `components/smart_display/settings_screen.h` draws the
+  page on the screen, `SETTING_RULES` in the add-on validates and stores the same keys.
+  docs/SETTINGS.md is the end-to-end recipe for adding one; never widen the eleven-key
+  `settings` block older firmware insists on.
 - Preserve fixed pages, hidden navigation at six tiles or fewer, and a
   minimum default standby of 600 seconds. Don't reintroduce free scrolling
   without physically testing for touch/navigation regressions.