fix(subtitles): recover canonical lines from ASS animation (#207)

src/renderer/subtitle-render.ts

@@ -677,10 +677,12 @@ export function prepareSecondarySubtitleLines(text: string): string[] {
     .split('\n')
     .map((line) => line.trim())
     .filter((line) => line.length > 0);
-  if (!isKaraokeLikeLineSet(lines)) {
-    return lines;
-  }
 
+  // Identical lines in one render are layered copies of the same event (animation
+  // scripts stack several per glyph), never distinct content -- always drop them, so a
+  // short stack like "Your ×4 / mosaic" collapses without needing the karaoke
+  // heuristic. Karaoke-likeness is still judged on the raw stack, where the layered
+  // repetition is the signal.
   const seen = new Set<string>();
   const unique: string[] = [];
   for (const line of lines) {
@@ -688,6 +690,10 @@ export function prepareSecondarySubtitleLines(text: string): string[] {
     seen.add(line);
     unique.push(line);
   }
+  if (!isKaraokeLikeLineSet(lines)) {
+    return unique;
+  }
+
   return [unique.join(' ')];
 }