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/Models/FlowSession/FlowTranscriptionError.swift

@@ -0,0 +1,14 @@
+// FlowTranscriptionError.swift
+// OSGKeyboard · Shared
+
+import Foundation
+
+public struct FlowTranscriptionError: Equatable, Sendable {
+    public let message: String
+    public let kind: FlowSessionKeys.TranscriptionErrorKind
+
+    public init(message: String, kind: FlowSessionKeys.TranscriptionErrorKind) {
+        self.message = message
+        self.kind = kind
+    }
+}