fix: 修复错误统计中 UNKNOWN 错误码问题

三处修复：
1. Analytics.logError() — 从通用 Error 提取 NSError domain:code，
   不再一律记录为 UNKNOWN
2. AppState — 通用 catch 已构造 AppError(LPB-901)，改用
   logAppError 记录，确保错误码正确归类
3. HomeView — 视频导入错误包装为 AppError(IMP-001)，
   添加 import LivePhotoCore

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

to-live-photo/to-live-photo/Analytics.swift

@@ -133,8 +133,12 @@ final class Analytics {
             // 记录到统计
             errorStats.record(code: appError.code, stage: appError.stage?.rawValue)
         } else {
-            // 通用错误
-            let code = "UNKNOWN"
+            // 从通用错误中提取有用信息
+            let nsError = error as NSError
+            let code = "\(nsError.domain):\(nsError.code)"
+            params["code"] = code
+            params["domain"] = nsError.domain
+            params["nsErrorCode"] = nsError.code
             errorStats.record(code: code, stage: nil)
         }
 

to-live-photo/to-live-photo/AppState.swift

@@ -168,13 +168,14 @@ final class AppState {
                 }
                 return nil
             } catch {
+                let appError = AppError(code: "LPB-901", message: "未知错误", underlyingErrorDescription: error.localizedDescription, suggestedActions: ["重试"])
                 await MainActor.run {
                     self.isProcessing = false
-                    self.processingError = AppError(code: "LPB-901", message: "未知错误", underlyingErrorDescription: error.localizedDescription, suggestedActions: ["重试"])
+                    self.processingError = appError
                     self.currentWorkId = nil
                     self.currentProcessingTask = nil
                 }
-                Analytics.shared.logError(.buildLivePhotoFail, error: error)
+                Analytics.shared.logAppError(.buildLivePhotoFail, appError: appError)
                 return nil
             }
         }

to-live-photo/to-live-photo/Views/HomeView.swift

@@ -9,6 +9,7 @@ import SwiftUI
 import PhotosUI
 import AVKit
 import Photos
+import LivePhotoCore
 
 struct HomeView: View {
     @Environment(AppState.self) private var appState
@@ -279,7 +280,12 @@ struct HomeView: View {
             errorMessage = String(format: format, error.localizedDescription)
             isLoading = false
             selectedItem = nil
-            Analytics.shared.logError(.importVideoFail, error: error)
+            let appError = AppError(
+                code: "IMP-001",
+                message: "视频导入失败",
+                underlyingErrorDescription: error.localizedDescription
+            )
+            Analytics.shared.logAppError(.importVideoFail, appError: appError)
         }
     }
 }