fix: correct guessit title parsing for character dictionary sync

backlog/tasks/task-140 - Prefer-parser-title-when-guessit-truncates-anime-name-for-character-dictionary-sync.md

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+---
+id: TASK-140
+title: Fix guessit title parsing for character dictionary sync
+status: Done
+assignee: []
+created_date: '2026-03-09 00:00'
+updated_date: '2026-03-09 00:25'
+labels:
+  - dictionary
+  - anilist
+  - bug
+  - guessit
+dependencies: []
+references:
+  - /home/sudacode/projects/japanese/SubMiner/src/core/services/anilist/anilist-updater.ts
+  - /home/sudacode/projects/japanese/SubMiner/src/core/services/anilist/anilist-updater.test.ts
+priority: high
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Fix AniList character dictionary auto-sync for filenames where `guessit` misparses the full path and our title extraction keeps only the first array segment, causing AniList resolution to match the wrong anime and abort merged dictionary refresh.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 AniList media guessing passes basename-only targets to `guessit` so parent folder names do not corrupt series title detection.
+- [x] #2 Guessit title arrays are combined into one usable title instead of truncating to the first segment.
+- [x] #3 Regression coverage includes the Bunny Girl Senpai filename shape that previously resolved to the wrong AniList entry.
+- [x] #4 Verification confirms the targeted AniList guessing tests pass.
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+Root repro: `guessit` parsed the Bunny Girl Senpai full path as `title: ["Rascal", "Does-not-Dream-of-Bunny-Girl-Senapi"]`, and our `firstString` helper kept only `Rascal`, which resolved to AniList 3490 (`rayca`) and produced zero character results. Fixed by sending basename-only input to `guessit` and joining multi-part guessit title arrays.
+<!-- SECTION:NOTES:END -->