feat(keyboard): harden clipboard command and add What's New sheet

Stabilize clipboard long-press prepare/resume across paste alerts and cold start, add an in-app release-notes sheet with remote bilingual HTML, localize typing input settings, and bump build to 55.

OSGKeyboardExt/Services/ClipboardPasteboardReader.swift

@@ -1,12 +1,27 @@
 // ClipboardPasteboardReader.swift
 // OSGKeyboard · Keyboard Extension
 //
-// Opportunity-read of UIPasteboard for clipboard-command eligibility.
+// Pasteboard peeks for clipboard-command UI and long-press snapshot capture.
+//
+// Idle affordance must use metadata only (`hasStrings` / `changeCount`) so the
+// system「允许粘贴」alert never appears while the keyboard is merely open.
+// Content reads (`string`) happen only on an explicit long-press.
 
 import UIKit
 import OSGKeyboardShared
 
 enum ClipboardPasteboardReader {
+    /// Metadata-only — does not trigger the paste permission prompt.
+    static func changeCount() -> Int {
+        UIPasteboard.general.changeCount
+    }
+
+    /// Metadata-only — whether the pasteboard currently holds string items.
+    static func hasStrings() -> Bool {
+        UIPasteboard.general.hasStrings
+    }
+
+    /// Content sample for long-press snapshot. May present the system paste alert.
     static func sample() -> (changeCount: Int, text: String?) {
         let board = UIPasteboard.general
         let changeCount = board.changeCount