Chat redesign work to improve chat navigation:
- New header title with channel name (thread list on mobile)
- New header title without channel name (thread list on full page chat)
- Removes the close button on threads (mobile only)
- Updates to back button route within thread (mobile), taking user to:
- The thread index, if they accessed the thread from the thread index.
- The channel itself, if they accessed the thread directly from the channel.
- The channel itself, if they accessed the thread from a notification.
- Show thread title in chat drawer header
- Properly convert emoji in thread titles in chat header (all devices)
- Upgrades various templates to use gjs format.
This commit contains multiple changes to improve the composer behavior especially in the context of a thread:
- Generally rename anything of the form `chatChannelThread...` to `chatThread...``
- Moves the textarea interactor instance inside the composer server
- Improves the focus state and closing of panel related to the use of the Escape shortcut
- Creates `Chat::ThreadList` as a component instead of having `Chat::Thread::ListItem` and others which could imply they were children of a the `Chat::Thread` component
