fix(seekbar): pulsewave clean connection, retrotape rolling wheel at playhead

Pulsewave: draw flat played line only up to where the Gaussian envelope
starts (startX), eliminating overlap between the flat line and the wave.

Retrotape: replace dual fixed-position reels with a single spinning reel
that tracks the playhead position across the full seek bar width.

fix(i18n): remove literal 'N' from skip-star descriptions in all languages

Replace 'After N skips' with natural phrasing ('after several skips') in
EN, FR, NL, NB, ZH. Simplify ratingsSkipStarThresholdLabel to a single
word (Skips / Sauts / Overslagen / Hopp / 跳过次数). DE was already fixed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/locales/zh.ts

@@ -500,8 +500,8 @@ export const zhTranslation = {
     ratingsSectionTitle: '评分',
     ratingsSkipStarTitle: '跳过以评 1 星',
     ratingsSkipStarDesc:
-      '连续跳过 N 次后将曲目设为 1 星。仅适用于此前未评分的曲目。',
-    ratingsSkipStarThresholdLabel: '跳过次数（至 1★）',
+      '连续多次跳过后将曲目设为 1 星。仅适用于此前未评分的曲目。',
+    ratingsSkipStarThresholdLabel: '跳过次数',
     ratingsMixFilterTitle: '按评分筛选',
     ratingsMixFilterDesc:
       '在{{mix}}与{{albums}}中筛选低评分内容。再次点击所选星标可关闭阈值。',