feat: add waveform generation and timeline display

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

src-tauri/src/commands/media_analysis.rs

@@ -1,4 +1,4 @@
-use crate::services::keyframe_index;
+use crate::services::{keyframe_index, waveform_generator};
 
 #[tauri::command]
 pub async fn extract_keyframes(file_path: String) -> Result<Vec<f64>, String> {
@@ -6,3 +6,15 @@ pub async fn extract_keyframes(file_path: String) -> Result<Vec<f64>, String> {
         .await
         .map_err(|e| format!("Task failed: {e}"))?
 }
+
+#[tauri::command]
+pub async fn extract_waveform(
+    file_path: String,
+    sample_count: usize,
+) -> Result<Vec<f64>, String> {
+    tokio::task::spawn_blocking(move || {
+        waveform_generator::extract_waveform(&file_path, sample_count)
+    })
+    .await
+    .map_err(|e| format!("Task failed: {e}"))?
+}