fix image preview

src-tauri/src/engine.rs

@@ -24,6 +24,14 @@ pub fn get_pause_state(state: tauri::State<'_, AppState>) -> bool {
     state.is_paused.load(Ordering::SeqCst)
 }
 
+use base64::{engine::general_purpose, Engine as _};
+
+#[tauri::command]
+pub fn get_image_base64(path: String) -> Result<String, String> {
+    let bytes = fs::read(path).map_err(|e| e.to_string())?;
+    Ok(general_purpose::STANDARD.encode(bytes))
+}
+
 #[tauri::command]
 pub fn get_timeline(date: String, base_dir: String) -> Vec<serde_json::Value> {
     let mut results = Vec::new();