* Add Channel Mention selection ability
* Fix mentioned user name being smaller than other text
* Improve logic for locating a mention
* Fix mentioning with enter on livestream
* Fix breaking for invalid URI query
* Handle punctuation after mention
* Fix name display and appeareance
* Use canonical url
* Fix missing search
## Issue
The loading circle wasn't showing up, causing confusion.
Splitting CSS doesn't seem trivial as there seems to be a huge dependency on the load order. Pretty much similar to what this person is facing https://lihautan.com/css-code-splitting/#the-problem
## Change
This reverts videojs-specific changes from 4d638bcf.
## Issue
Channel links were showing the "This channel isn't staking enough LBRY Credits for link previews." -- channel links shouldn't be showing previews in the first place.
## Change
Moved the logic into `ClaimLink`, which is the better place to put it anyway. I think I was trying to not touch as many components as possible (i.e. not passing `allowPreview` down too many layers) in the initial implementation. This caused the `isChannel` consideration to be missed.
## Issue
- Redo 5636: Disable video previews in comments/posts made by channels below a certain channel staked level
- Closes 5738: expand video preview level requierment to markdown images also
