chore: prepare release 1.18.2 (#945)

> [!IMPORTANT]
> Merging this PR will create a new release.

## Fixes

* Adding servers in the explore tab now persist in account data and are
actually added to the list.
([#953](<#953>) by @7w1)
* Added a button to leave all rooms/subspaces within a space in the
leave space confirmation dialog. Also has text to show number of
children. ([#953](<#953>) by
@7w1)
* Added a setting to play notification sounds when tab is in background,
enabled by default.
([#953](<#953>) by @7w1)
* Centered the notification bell icon in the room list.
([#954](<#954>) by @7w1)
* Fixed edit diffs not properly scaling with zoom.
([#951](<#951>) by @7w1)
* Fixed icons not scaling with zoom.
([#951](<#951>) by @7w1)
* Fixed invalid language tag when no locale set for some systems.
([#953](<#953>) by @7w1)
* Fixed replying to reaction/edit events not replying.
([#942](<#942>) by @7w1)
* Fix sending thread messages sometimes sending in the general timeline
([#944](<#944>) by @nushea)

### Updates Twemoji to from v15 to v17 🫪
([#950](<#950>) by @7w1,
@hazre)

You can check here for emoji changes:

- https://www.unicode.org/emoji/charts-16.0/emoji-released.html
- https://www.unicode.org/emoji/charts-17.0/emoji-released.html

Author: 7w1