- replaced many uses of `as any` with another more specific cast `as T`
- filled in missing typed for items that needed to be typed
  - new runtime code was added where necessary to satisfy the new types with comments
- added missing theme variable "sidebar-active" to the Theme variables
- forms using `react-hook-form` are now typechecked
- changed some instances of `target` into `currentTarget` while removing `as any` assertions

Fix invite / friends menu having sidebars.

Add icon stacking mask.

Add remove / block user confirmation.

Fix: Clear status if empty string given.

Modals: Allow all modals to be closed by ESC (permitting).
Fix: Handle closing DMs properly. Stop propagation too.

Support re-connecting after going / starting offline.

Add profile links / app links back.
Add quoting / mentioning back.