- remove anon option in channel dropdown when livestream tab is selected
- attempt to fill publish form with current active channel name just prior to publishing to (edge condition)
- edge condition occurs when user fills out form fully. User switches to Post (which allows anon in drop down selector). User selects Anon channel, then switches back to the livestream tab. The form was previously updated with `channel: undefined` but does not get changed when clicking the livestream tab. So we just updated the form one last time prior to publishing as a livestream
- Show most recent livestream claim on livestream setup page instead of first livestream claim
## Issue
Closes 5721: Publish-Preview updates
## Changes
(1) Match the recent "incognito" change that sets the channel to `undefined` via `updatePublishForm`. This change would also cover `null` -- I don't think it's being used to represent something else, so showing "Anonymous" for `null` should be fine.
(2) Added channel icons, so it'll be more obvious to the user if they accidentally selected the wrong channel.
## Issue
Closes 5687: Ensure post mode has no text limit
## Changes
- `type="markdown"` can now have unlimited length if clients don't define `textAreaMaxWidth`.
- The internal default limit of 2000 is narrowed down to `type=textarea`.
## Issue
Closes 3661: Autoplay + Related go into loops ( infinite ) sometimes
## GUI
Push the actual "next" item into the top of the list.
## History search
1. Skip if the next item is itself.
2. The URL stored in the history comes in various forms, so a direct comparison won't work.
- There's also a weird case where the URL differs by just a little (p.09 vs p-09), but with the same claim ID:
lbry://vacuum-tube-computer-p.09-–-building#5212bc8bc63c373e2bf1ebc5b765595ed7b6514d
lbry://vacuum-tube-computer-p-09-–-building#5212bc8bc63c373e2bf1ebc5b765595ed7b6514d
Check the claim_id as well to cover cases like these.
