Add a Hide Shorts toggle to the view options

Videos carry isShort from Yattee Server and Piped, and Invidious feed
entries are taken as Shorts when they arrive with no length and aren't
live or upcoming: the feed comes from RSS, which lists Shorts, while
lengths come from the Videos tab, which doesn't. Subscriptions, search
and instance browse hide videos known to be Shorts when the toggle is
on; videos whose source can't tell are always shown.

Yattee/Services/API/PipedAPI.swift

@@ -884,7 +884,8 @@ private struct PipedVideo: Decodable, Sendable {
             thumbnails: Thumbnail.fallbackChain(for: thumbnail.flatMap { URL(string: $0) }),
             isLive: duration == -1,
             isUpcoming: false,
-            scheduledStartTime: nil
+            scheduledStartTime: nil,
+            isShort: isShort
         )
     }
 }
@@ -1092,6 +1093,7 @@ private struct PipedSearchItem: Decodable, Sendable {
     let views: Int64?
     let videos: Int64?
     let subscribers: Int64?
+    let isShort: Bool?
 
     var videoId: String? {
         url?.replacingOccurrences(of: "/watch?v=", with: "")
@@ -1123,7 +1125,8 @@ private struct PipedSearchItem: Decodable, Sendable {
             thumbnails: Thumbnail.fallbackChain(for: thumbnail.flatMap { URL(string: $0) }),
             isLive: duration == -1,
             isUpcoming: false,
-            scheduledStartTime: nil
+            scheduledStartTime: nil,
+            isShort: isShort
         )
     }