feat: add JSON export/import for session backup

[30BTW]

Summary

This PR adds JSON export and import functionality for individual chat sessions, allowing users to backup and restore complete conversation data.

Features Added

Export:

• Added "JSON" format option in the export dialog
• Exports complete session data including messages, settings, and threads
• Generated files use .chatbox.json extension for easy identification

Import:

• Added "Import Session" section in Settings → General
• Supports importing .chatbox.json files
• Automatically generates new IDs to avoid conflicts
• Shows success/error feedback after import

Technical Details

• Added SessionExportData interface with version control for future compatibility
• Implemented exportSessionAsJson() and importSessionFromJson() functions
• Import properly triggers UI refresh using updateSessionList()
• Added i18n support for both English and Chinese

File Changes

• src/shared/types.ts - Added type definitions and version constant
• src/renderer/stores/sessionHelpers.ts - Core export/import logic
• src/renderer/modals/ExportChat.tsx - Added JSON format option
• src/renderer/routes/settings/general.tsx - Added import UI
• src/renderer/i18n/locales/en/translation.json - English translations
• src/renderer/i18n/locales/zh-Hans/translation.json - Chinese translations

Export File Format

{
  "__version": 1,
  "__exported_at": "2026-05-06T17:35:04.791Z",
  "__source": "chatbox",
  "session": { ... }
}

Test Plan

• Export session as JSON file
• Verify JSON file contains complete session data
• Import JSON file and verify session appears in list
• Test ID conflict handling (imported sessions get new IDs)
• Test version compatibility check
• Test with both English and Chinese UI

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