feat(keyboard): ship AI hint carousel, home library cards, and clipboard polish

Rotate AI idle suggestions with optional remote packs, move history/dictionary onto self-sizing Home preview cards, harden clipboard capture/prompting, and simplify keyboard chrome by dropping most liquid-glass shadows.

OSGKeyboardShared/Utilities/TranscriptOverlapUtilities.swift

@@ -0,0 +1,28 @@
+// TranscriptOverlapUtilities.swift
+// OSGKeyboard · Shared
+//
+// Shared normalization and raw-prefix mapping for transcript overlap checks.
+
+import Foundation
+
+enum TranscriptOverlapUtilities {
+    static func normalized(_ text: String) -> String {
+        text.unicodeScalars.filter {
+            !CharacterSet.whitespacesAndNewlines.contains($0)
+                && !CharacterSet.punctuationCharacters.contains($0)
+        }.map { Character($0) }.reduce(into: "") { $0.append($1) }
+    }
+
+    static func rawDropCount(in text: String, normalizedPrefixLength: Int) -> Int {
+        var normalizedCount = 0
+        var rawIndex = text.startIndex
+        while rawIndex < text.endIndex, normalizedCount < normalizedPrefixLength {
+            let character = text[rawIndex]
+            if !character.isWhitespace, !character.isPunctuation {
+                normalizedCount += 1
+            }
+            rawIndex = text.index(after: rawIndex)
+        }
+        return text.distance(from: text.startIndex, to: rawIndex)
+    }
+}