Add Pomodoro UI with 1/3/5/10 presets and custom keypad.

Replace Beep/WAV list screen with a timer; pick duration via presets or Set numpad (1-99 min), and keep selectable alarm sounds.

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

include/pomodoro.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <stdint.h>
+
+enum PomoState : uint8_t {
+  POMO_IDLE = 0,
+  POMO_RUNNING = 1,
+  POMO_PAUSED = 2,
+  POMO_DONE = 3,
+};
+
+void pomo_init();
+void pomo_tick();
+
+PomoState pomo_state();
+uint32_t pomo_remaining_sec();
+uint16_t pomo_duration_minutes(); // last configured length
+
+void pomo_set_minutes(uint16_t minutes); // 1..99; idle/paused/done only
+void pomo_start_pause();
+void pomo_reset();
+void pomo_adjust_minutes(int8_t delta);
+
+const char *pomo_state_name();
+bool pomo_consume_alarm();

include/ui.h

@@ -5,9 +5,6 @@
 
 void ui_create();
 void ui_update(const SdCardInfo &info);
+void ui_tick(); // refresh timer + fire alarm sound
 void ui_refresh_audio_buttons();
-void ui_refresh_lists();
 void ui_set_touch_debug(int16_t lx, int16_t ly, bool down);
-
-// 0=Beep 1=WAV
-uint8_t ui_active_tab();