release: publish Multi-Debrid Downloader v2.0.15

Synchronize live speed telemetry, preserve known package sizes, refine responsive download status presentation, improve progress contrast and accessibility, simplify account creation, and prepare the verified v2.0.15 desktop release.

src/main/download-size.ts

@@ -0,0 +1,12 @@
+export function mergeKnownTotalBytes(
+  currentTotalBytes: number | null | undefined,
+  replacementTotalBytes: number | null | undefined
+): number | null {
+  if (replacementTotalBytes != null && Number.isFinite(replacementTotalBytes) && replacementTotalBytes > 0) {
+    return replacementTotalBytes;
+  }
+  if (currentTotalBytes != null && Number.isFinite(currentTotalBytes) && currentTotalBytes > 0) {
+    return currentTotalBytes;
+  }
+  return null;
+}