Show watch progress bar on thumbnails in playlist, channel, and search views

These views rendered video thumbnails without passing watchProgress, so the
progress bar was silently missing. Apply the existing pattern from
SubscriptionsView: maintain a watchEntriesMap and forward watchProgress(for:)
to VideoRowView/VideoCardView at each call site.

Yattee/Views/Playlist/PlaylistVideoRowView.swift

@@ -13,12 +13,14 @@ import SwiftUI
 struct PlaylistVideoRowView: View {
     let index: Int
     let video: Video
+    var watchProgress: Double? = nil
     var onRemove: (() -> Void)? = nil
 
     var body: some View {
         VideoRowView(
             video: video,
             style: .regular,
+            watchProgress: watchProgress,
             index: index
         )
         .videoContextMenu(
@@ -40,9 +42,10 @@ struct PlaylistVideoRowView: View {
 
 extension PlaylistVideoRowView {
     /// Initialize from a LocalPlaylistItem model.
-    init(item: LocalPlaylistItem, index: Int, onRemove: @escaping () -> Void) {
+    init(item: LocalPlaylistItem, index: Int, watchProgress: Double? = nil, onRemove: @escaping () -> Void) {
         self.index = index
         self.video = item.toVideo()
+        self.watchProgress = watchProgress
         self.onRemove = onRemove
     }
 }