Merge PR #24: Various UI improvements from riversedge

Includes progress bar, drag and drop, gender buttons, upload
improvements, and dynamic duration limits.

types.ts

@@ -8,6 +8,9 @@ export interface Song {
   createdAt: Date;
   isGenerating?: boolean;
   queuePosition?: number; // Position in queue (undefined = actively generating, number = waiting in queue)
+  progress?: number;
+  stage?: string;
+  generationParams?: any;
   tags: string[];
   audioUrl?: string;
   isPublic?: boolean;
@@ -88,6 +91,8 @@ export interface GenerationParams {
   // Expert Parameters
   referenceAudioUrl?: string;
   sourceAudioUrl?: string;
+  referenceAudioTitle?: string;
+  sourceAudioTitle?: string;
   audioCodes?: string;
   repaintingStart?: number;
   repaintingEnd?: number;