Rewrite frontend as single self-contained HTML file — all CSS/JS inline, no external files to fail loading

dist/utils/costEstimator.d.ts

@@ -0,0 +1,9 @@
+import { Config } from '../config/config';
+import { CostBreakdown } from '../interfaces';
+/**
+ * Estimate the cost of generating audio descriptions for a video
+ * @param videoFilePath - Path to the input video file
+ * @param options - Optional configuration overrides
+ * @returns Cost estimation breakdown
+ */
+export declare function estimateCost(videoFilePath: string, options?: Partial<Config>): Promise<CostBreakdown>;