Improve music processing robustness and workflow UX

Unify safe file-move behavior and richer progress semantics across backend tasks, while upgrading traditional-to-simplified conversion and refining the frontend multi-step panels for clearer execution feedback.

frontend/src/api/progress.ts

@@ -10,9 +10,18 @@ export interface ProgressMessage {
   currentFile: string;
   message: string;
   completed: boolean;
+  duplicateGroups?: number;
+  movedFiles?: number;
+  organizedFiles?: number;
+  manualFixFiles?: number;
+  traditionalEntries?: number;
+  failedFiles?: number;
+  albumsMerged?: number;
+  tracksMerged?: number;
+  upgradedFiles?: number;
+  skippedFiles?: number;
 }
 
 export function getProgress(taskId: string): Promise<ProgressMessage | null> {
   return request.get(`/api/progress/${taskId}`);
 }
-