Sync with upstream Element, new Linux packaging, and fixes to Social's repost verification:
- Sync with the latest upstream Element
- Add a pacman package for Arch Linux
- Fix matrix-seshat (local encrypted-room message search) not actually working in any Linux build
- Add a repost/reply source verification badge, fix cases where it falsely flagged genuine reposts as forgeries
- Add right-click on a Social reaction pill to open the reactions dialog
- Show MSC4144 per-message profiles in the room timeline and Social
- Add a "Copy Pack" option and guard the settings dialog from closing with unsaved pack edits
- Fix the emoji picker's Enter key, layout, and blurry pack image thumbnails
- Increase reaction pill and tooltip sizes
- Move "View Devices" into the developer-mode button list and show it on your own profile
- Fix the Share dialog freezing under some browsers' canvas privacy protections
- Fix SSO login using the wrong protocol on desktop
