Packing list bulk import:
- Import button in packing list header opens a modal
- Paste items or load CSV/TXT file
- Format: Category, Name, Weight (g), Bag, checked/unchecked
- Bags are auto-created if they don't exist
- Server endpoint POST /packing/import with transaction
i18n sync:
- Added all missing translation keys to fr, es, nl, ru, zh, ar
- All 8 language files now have matching key sets
- Includes memories, vacay weekdays, packing import, settlement,
GPX import, blur booking codes, transport timeline keys
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