feat: full integration with FreeRTOS tasks and slideshow state machine

Co-authored-by: Cursor <cursoragent@cursor.com>

src/settings.h

@@ -57,6 +57,7 @@ public:
     Settings get();
     void save(const Settings& s);
     void saveField(const char* key, uint8_t value);
+    void saveField(const char* key, uint32_t value);
     void saveField(const char* key, const char* value);
     void factoryReset();
     bool isProvisioned();