Remove unnecessary @ts-ignores
Use @ts-expect-error instead of @ts-ignore for external dependencies

Fix imports
Convert some files to TS

* fix(invite): decode the meeting name

* squash: try to make mobile join same encoded meeting name as web

* Decodes and generated texts for share and copy meeting info.

Decodes in all cases except when it contains a space, as it will generate wrong links when pasted/shared in external applications.

* feat(welcome-page): Redesign.

* Style adjustments.