feat: add video resolver, URL input, and video player

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

src-tauri/src/commands/video.rs

@@ -1 +1,12 @@
-// Video resolve and download commands — implemented in Task 4/5
+use crate::models::{CookieSource, VideoMetadata};
+use crate::services::video_resolver;
+
+#[tauri::command]
+pub async fn resolve_url(
+    url: String,
+    cookie_source: CookieSource,
+) -> Result<VideoMetadata, String> {
+    tokio::task::spawn_blocking(move || video_resolver::resolve(&url, &cookie_source))
+        .await
+        .map_err(|e| format!("Task failed: {e}"))?
+}