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>

src/esp32/main.cpp

@@ -7,6 +7,7 @@
 #include "app.h"
 #include "config.h"
 #include "display/bitmap_store.h"
+#include "display/page_store.h"
 #include "logic/status_led.h"
 #include "nano_link/nano_flash_bridge.h"
 #include "net/ha_api.h"
@@ -33,6 +34,7 @@ void setup()
 	BootMode boot_mode = firmwareGuardBegin();
 
 	bitmapStoreBegin();
+	pageStoreBegin(); // the Clock page as a page that can be edited
 	appLoadSettings();
 
 	if (boot_mode == BootMode::Normal)