Refresh expired thumbnail URLs for downloads and video info

Proxied thumbnail URLs from Invidious/Piped/Yattee server expire over
time. Two paths were left holding stale URLs: the Video Info carousel
kept the original list copy even after fresh details arrived, and
downloaded videos rendered from the remote URL snapshot taken at
download time while the local thumbnail on disk was ignored.

Evict stale URLs from the Nuke cache when fresh video details load,
pass the fresh details through to the videoCard thumbnail, and resolve
downloads' thumbnails from the local file when localThumbnailPath is
set.

Yattee/Services/ImageLoading/ImageLoadingService.swift

@@ -63,6 +63,15 @@ final class ImageLoadingService: Sendable {
         )
     }
 
+    /// Remove a specific URL from both the memory and disk image caches.
+    /// Use when a previously cached URL is known to return stale or broken
+    /// data (e.g. an expired proxied thumbnail URL).
+    func removeCachedImage(for url: URL) {
+        let request = ImageRequest(url: url)
+        ImagePipeline.shared.cache.removeCachedImage(for: request)
+        ImagePipeline.shared.cache.removeCachedData(for: request)
+    }
+
     /// Clear all image caches (memory and disk).
     func clearCache() {
         // Clear memory cache