refactoring into multiple files, not tested on hardware

epaper_manager.h

@@ -0,0 +1,31 @@
+#ifndef EPAPER_MANAGER_H
+#define EPAPER_MANAGER_H
+
+#include <stdbool.h>
+
+/**
+ * Launches the e-Paper display handling loop on Core 1.
+ * This function returns immediately after launching the core.
+ */
+void epaper_start_background_thread();
+
+/**
+ * Sends an update to the e-Paper display.
+ * @param entry The text content of the current line.
+ * @param finish_line If true, the line is committed (moved to the list of static lines).
+ *                    If false, it updates the current line being typed.
+ */
+void epaper_send_update(const char *entry, bool finish_line);
+
+/**
+ * Clears all text entries and refreshes the display to white.
+ */
+void epaper_clear();
+
+/**
+ * Forces a full refresh of the display on the next update.
+ * Useful for clearing ghosting.
+ */
+void epaper_force_refresh();
+
+#endif // EPAPER_MANAGER_H