feat: add waveform generation and timeline display

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

src-tauri/src/lib.rs

@@ -17,6 +17,7 @@ pub fn run() {
             video::resolve_url,
             video::start_download,
             media_analysis::extract_keyframes,
+            media_analysis::extract_waveform,
         ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");