Rules can leave a manual pick alone, Clock is an editable page, fix HA attributes

- Rules: "also over a page chosen by hand" (on by default); off, a rule
  waits until the manual pick ends. Schedule store version 3, version 2
  records are read with the option on.
- The Clock page is stored at boot from the built-in one and can be
  edited; Reset (deleting it) brings back the original.
- Home Assistant attributes were never found: ArduinoJson 7.4 takes a
  char array key as a literal of its full array length.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CLAUDE.md

@@ -164,8 +164,13 @@ See README.md for the overview.
   versioned binary struct (`display/page_store.cpp`, bump `VERSION` when `DynamicPage`
   changes). They are drawn only on the ESP32 (`logic/page_render`), also for the web
   previews, so there is one renderer. Pages and bitmaps share one namespace (checked in
-  `app.cpp`); things a page uses can't be deleted. The built-in page "Clock" replaces the
-  old hardcoded clock (also the default and the HA "Clock" option).
+  `app.cpp`); things a page uses can't be deleted. The page "Clock" replaces the
+  old hardcoded clock (also the default and the HA "Clock" option). `pageStoreBegin()`
+  stores a copy of each built-in page (`logic/builtin_pages`) at boot when none is stored,
+  so it can be edited; the built-in one is the fallback, and deleting the copy resets it.
+- `ha_api` attribute lookups: cast `char` arrays to `const char *` for ArduinoJson keys.
+  ArduinoJson 7.4 takes a `char[N]` as a literal of length N-1, which never matches (that
+  broke all attributes from 2.9.0 to 2.10.0).
 - Moving pages: `renderPage()` returns when the page changes next (scroll step, second);
   `FlipdotFrames` sends those frames as `D1` (no effect) and paces them by the estimated
   receive and flip time, because the Nano has no acknowledgement. Full screen frames go