Add dictionary auto-sort and batch import

[leoxs22]

Summary

• Auto-sort: Reorders installed dictionaries by a recommended priority based on well-known Yomitan dictionary names (frequency, pitch, monolingual, bilingual, grammar, kanji — for JA, YUE, and ZH). Unrecognised dictionaries keep their relative order at the end. Accessible via an "Auto-sort" button next to the "Installed Dictionaries" header.
• Batch import: Three new import modes behind a dropdown menu on the existing import button:
  • Import Files — multi-file picker (OpenMultipleDocuments) to select several ZIPs at once
  • Import from Folder — folder picker (OpenDocumentTree) that enumerates and imports all ZIPs in a directory
  • Nested ZIP auto-detection — if a ZIP has no index.json but contains inner .zip entries, each is extracted and imported automatically
• All batch imports are processed sequentially within a single WorkManager Worker, with per-dict error isolation (duplicates are skipped, failures are logged, remaining dicts continue)
• Batch progress shown in the UI as "Importing Dictionaries (2 of 5)"

Test plan

• Select multiple dictionary ZIPs via "Import Files" — all import, duplicates skipped
• Select a folder with dictionary ZIPs via "Import from Folder" — all enumerate and import
• Import a ZIP containing multiple dictionary ZIPs (nested) — auto-detects and imports each
• Import a single ZIP — still works as before
• Include a duplicate in a batch — skipped without stopping the rest
• Tap "Auto-sort" with installed dictionaries — reorders by recommended priority
• Run ./gradlew :domain:test — all tests pass (including 9 new DictionaryAutoSorterTest cases)

🤖 Generated with Claude Code