feat(ai): unify reply center and refresh keyboard AI features

- Merge invitation, task, blessing, clarification, and empathy actions
  into a single Reply flow, with three fixed, clearly labeled stance
  choices whenever user intent must not be guessed.
- Refine clipboard semantic routing with bilingual schedule,
  confirmation, and follow-up models, conservative language thresholds,
  and explicit-assignment guard for complaint-only text.
- Persist Apple account refresh state, harden session recovery, and
  surface durable account diagnostics across keyboard and app.
- Derive personal-style prompts through two-stage corpus evidence and
  apply real low-confidence ASR tendencies instead of neutral templates.
- Localize the new reply center, clipboard semantics, and personal-style
  surfaces in both English and Simplified Chinese.

OSGKeyboardShared/Services/ClipboardReplyFeedbackStore.swift

@@ -12,6 +12,18 @@ public struct ClipboardReplyCandidateSnapshot: Codable, Equatable, Identifiable,
         case ordinary
         case formal
         case playful
+        case invitationAccept
+        case invitationDecline
+        case invitationTentative
+        case taskAcknowledge
+        case taskClarify
+        case taskNegotiate
+        case blessingReturn
+        case blessingWarm
+        case blessingPlayful
+        case clarificationDirect
+        case clarificationQuestion
+        case clarificationConfirm
     }
 
     public let id: UUID
@@ -121,12 +133,29 @@ public final class ClipboardReplyFeedbackStore {
         now: Date = Date()
     ) -> [PolishStyleReplyLearningExample] {
         records(now: now).compactMap { record in
-            guard record.outcome != .awaitingSelection,
-                  let ordinary = record.candidates.first(where: {
-                      $0.kind == .ordinary
-                  }) else {
+            guard record.outcome != .awaitingSelection else {
                 return nil
             }
+            guard let ordinary = record.candidates.first(where: {
+                $0.kind == .ordinary
+            }) else {
+                // Scene-specific choices express the user's decision, not a
+                // reusable tone preference. Only a later user-authored edit is
+                // valid personal-style evidence.
+                guard record.outcome == .selected,
+                      let selected = record.selectedCandidate,
+                      let finalText = record.finalText else {
+                    return nil
+                }
+                return PolishStyleReplyLearningExample(
+                    receivedMessage: record.sourceText,
+                    ordinaryCandidate: selected.text,
+                    selection: .contextual,
+                    finalEdit: finalText,
+                    createdAt: record.createdAt,
+                    styleID: record.styleID
+                )
+            }
             let selection: PolishStyleReplySelection
             if record.outcome == .discarded {
                 selection = .discarded
@@ -279,6 +308,19 @@ public final class ClipboardReplyFeedbackStore {
             return .formal
         case .playful:
             return .playful
+        case .invitationAccept,
+             .invitationDecline,
+             .invitationTentative,
+             .taskAcknowledge,
+             .taskClarify,
+             .taskNegotiate,
+             .blessingReturn,
+             .blessingWarm,
+             .blessingPlayful,
+             .clarificationDirect,
+             .clarificationQuestion,
+             .clarificationConfirm:
+            return .contextual
         }
     }