Present row sheets through the shared sheet host

Each video row carried its own sheets: tappableVideo added the queue
action and resume sheets, the context menu and swipe actions added
add-to-playlist and download options, so a row could declare up to six
sheets, owned by a row that a list may recycle.

Rows now present those through the nearest sheet host, as does the
video info view's resume prompt. The queue action sheet for a tapped
description link becomes a global request instead of being declared
at both the app root and the expanded player.

Sheets take the color scheme where their host sits, so the floating
details panel's dark override no longer reaches them and the
presentationColorScheme workaround is gone.

Yattee/Views/Components/VideoSwipeActionsModifier.swift

@@ -12,22 +12,14 @@ import SwiftUI
 struct VideoSwipeActionsModifier: ViewModifier {
     @Environment(\.appEnvironment) private var appEnvironment
     @Environment(\.videoQueueContext) private var queueContext
+    @Environment(\.presentAppSheet) private var presentAppSheet
 
     let video: Video
     var fixedActions: [SwipeAction] = []
 
-    @State private var showingPlaylistSheet = false
-    @State private var showingDownloadSheet = false
-
     func body(content: Content) -> some View {
         content
             .swipeActions(actionsArray: allActions())
-            .sheet(isPresented: $showingPlaylistSheet) {
-                PlaylistSelectorSheet(video: video)
-            }
-            .sheet(isPresented: $showingDownloadSheet) {
-                DownloadQualitySheet(video: video)
-            }
     }
 
     private var visibleActions: [VideoSwipeAction] {
@@ -104,7 +96,7 @@ struct VideoSwipeActionsModifier: ViewModifier {
                 tint: action.tint,
                 background: action.backgroundColor
             ) { reset in
-                showingPlaylistSheet = true
+                presentAppSheet(.addToPlaylist(video))
                 reset()
             }
 
@@ -223,7 +215,7 @@ struct VideoSwipeActionsModifier: ViewModifier {
 
     private func startDownload() {
         guard let appEnvironment else {
-            showingDownloadSheet = true
+            presentAppSheet(.downloadOptions(video))
             return
         }
 
@@ -277,7 +269,7 @@ struct VideoSwipeActionsModifier: ViewModifier {
                 }
             }
         } else {
-            showingDownloadSheet = true
+            presentAppSheet(.downloadOptions(video))
         }
     }
 }