Add file selection screen

src/screens/FileSelectionScreen.h

@@ -0,0 +1,28 @@
+#pragma once
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+
+#include <functional>
+#include <string>
+#include <vector>
+
+#include "Screen.h"
+
+class FileSelectionScreen final : public Screen {
+  TaskHandle_t displayTaskHandle = nullptr;
+  std::vector<std::string> files;
+  int selectorIndex = 0;
+  bool updateRequired = false;
+  const std::function<void(const std::string&)> onSelect;
+
+  static void taskTrampoline(void* param);
+  [[noreturn]] void displayTaskLoop();
+  void render() const;
+
+ public:
+  explicit FileSelectionScreen(EpdRenderer* renderer, const std::function<void(const std::string&)>& onSelect)
+      : Screen(renderer), onSelect(onSelect) {}
+  void onEnter() override;
+  void onExit() override;
+  void handleInput(Input input) override;
+};