Add bulk archive feature for old applications

[5queezer]

Summary

This PR adds a new "Archive Old" dropdown feature that allows users to bulk archive applications older than a specified number of days (30, 60, 90, or 180 days).

Key Changes

• New ArchiveOldDropdown component: A dropdown menu that displays archive thresholds with counts of applications that would be archived for each option
• Bulk archive mutation: Added bulkArchiveMutation to handle archiving multiple applications in parallel
• handleBulkArchive function: Filters applications by age, shows a confirmation dialog, and triggers the bulk archive operation
• UI integration: The dropdown is displayed in the dashboard toolbar when viewing active applications (not archived view)
• Localization: Added translation keys for English and German:
  • archive_old: Button label
  • archive_old_option: Dropdown menu item text with days parameter
  • archive_old_confirm: Confirmation dialog with count and days parameters
  • archive_old_archiving: Loading state text

Implementation Details

• The dropdown uses useRef and useEffect to handle click-outside behavior for closing the menu
• Application age is determined by appliedAt date if available, otherwise falls back to createdAt
• The count for each threshold is calculated dynamically using useCallback to avoid unnecessary recalculations
• Disabled state is applied to threshold options with zero matching applications
• Loading state is managed through the isPending prop from the mutation
• Styling includes responsive design (full width on mobile, auto width on desktop) and dark mode support

https://claude.ai/code/session_01XjeBMDALg8J9i3DxWzxrkv

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