feat(release): prepare v0.19.5 with subtitle pipeline improvements

- Rework ASS, YouTube, overlapping, and secondary subtitle handling
- Keep overlay, mining, sidebar, and stats aligned with visible cues
- Harden release-note validation and package Linux thumbnail support

docs-site/public/config.example.jsonc

@@ -529,7 +529,7 @@
   // ==========================================
   // AnkiConnect Integration
   // Automatic Anki updates and media generation options.
-  // Hot-reload: ankiConnect.ai.enabled, media.normalizeAudio/mirrorMpvVolume, knownWords, nPlusOne, fields.word/audio/image/sentence/miscInfo, behavior.autoUpdateNewCards, isLapis.sentenceCardModel, isKiku.fieldGrouping, and lapisKiku.wordCardKind update live while SubMiner is running.
+  // Hot-reload: ankiConnect.ai.enabled, media.normalizeAudio/mirrorMpvVolume, knownWords, nPlusOne, fields.word/audio/image/sentence/miscInfo, behavior.autoUpdateNewCards, isLapis.sentenceCardModel, isKiku.fieldGrouping, isSenren.fieldGrouping, and lapisKiku.wordCardKind update live while SubMiner is running.
   // Shared AI provider transport settings are read from top-level ai and typically require restart.
   // Most other AnkiConnect settings still require restart.
   // ==========================================
@@ -612,6 +612,11 @@
       "fieldGrouping": "disabled", // Kiku duplicate-card field grouping mode. Values: auto | manual | disabled
       "deleteDuplicateInAuto": true // When Kiku field grouping is "auto", delete the duplicate source card after grouping completes. Values: true | false
     }, // Is kiku setting.
+    "isSenren": {
+      "enabled": false, // Enable Senren-specific duplicate handling (scene-switching field grouping, including miscInfo grouping). Mutually exclusive with isKiku.enabled. Values: true | false
+      "fieldGrouping": "auto", // Senren duplicate-card field grouping mode (scene switching). Values: auto | manual | disabled
+      "deleteDuplicateInAuto": true // When Senren field grouping is "auto", delete the duplicate source card after grouping completes. Values: true | false
+    }, // Is senren setting.
     "lapisKiku": {
       "wordCardKind": "word-and-sentence" // Card-type flag SubMiner marks on Kiku/Lapis word cards. Only one flag is set at a time; the others are cleared. Requires isKiku.enabled or isLapis.enabled. Values: word-and-sentence | click | sentence | audio | none
     } // Lapis kiku setting.