fix: clear thumbnail cache and temp dirs on new session

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

src-tauri/src/commands/media_analysis.rs

@@ -35,3 +35,10 @@ pub async fn extract_thumbnails(
     .await
     .map_err(|e| format!("Task failed: {e}"))?
 }
+
+#[tauri::command]
+pub async fn cleanup_thumbnails(paths: Vec<String>) -> Result<(), String> {
+    tokio::task::spawn_blocking(move || thumbnail_extractor::cleanup_thumbnail_dirs(&paths))
+        .await
+        .map_err(|e| format!("Task failed: {e}"))?
+}

src-tauri/src/lib.rs

@@ -19,6 +19,7 @@ pub fn run() {
             media_analysis::extract_keyframes,
             media_analysis::extract_waveform,
             media_analysis::extract_thumbnails,
+            media_analysis::cleanup_thumbnails,
         ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");

src-tauri/src/services/thumbnail_extractor.rs

@@ -76,6 +76,17 @@ pub fn extract_thumbnails(
     Ok(sheets)
 }
 
+pub fn cleanup_thumbnail_dirs(paths: &[String]) -> Result<(), String> {
+    for path in paths {
+        let dir = std::path::Path::new(path);
+        if dir.is_dir() {
+            std::fs::remove_dir_all(dir)
+                .map_err(|e| format!("Failed to remove thumbnail dir {path}: {e}"))?;
+        }
+    }
+    Ok(())
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;