add app icon, rename to Sticker Cloner, pack thumbnails, sort list, smaller stickers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

StickerCloner/StickerCloner MessagesExtension/StickerBrowserViewController.swift

@@ -4,6 +4,15 @@ import UIKit
 final class StickerBrowserViewController: MSStickerBrowserViewController {
 	private var stickers: [MSSticker] = []
 
+	init() {
+		super.init(stickerSize: .small)
+	}
+
+	@available(*, unavailable)
+	required init?(coder: NSCoder) {
+		fatalError("init(coder:) is not supported")
+	}
+
 	func reloadStickers() {
 		let urls = StickerStore.shared.stickerFileURLs()
 		stickers = urls.compactMap { url in