- Created demo emails with various states (inbox, sent, drafts, trash, etc.) in `emails.ts`.
- Added demo file nodes representing directories and files in `files.ts`.
- Implemented demo Sieve capabilities and scripts in `filters.ts`.
- Defined demo identities for users in `identities.ts`.
- Established demo mailboxes with permissions and counts in `mailboxes.ts`.
- Created a demo vacation response in `vacation.ts`.
- Introduced a comprehensive JMAP client interface in `client-interface.ts` to standardize interactions with the JMAP API.
- Add subscribe option to toolbar import dropdown menu
- Add right-click context menu on subscribed calendars (refresh/unsubscribe)
- Show refresh spinner on subscription calendars during sync
- Support webcal:// protocol URLs (auto-converts to https://)
- Update i18n strings with webcal:// references
Linus Rath