[Sprint/InterestingIguana](chore): adjust channel sidebar UI

Made some adjustments to the buttons on the channel sidebar to accommodate incoming referrals action button. Referrals button will be added once referrals console is live.

Biggest change is moving the settings cog for other peoples channels up to where the edit pencil is on your own channel. And making it a meatball.

When the cog is out of the way, we have enough width so that the 'message' button label can always be visible, so never gets to this awkward place:

One's own channel would look something like this:

Someone else's would look something like this (at diff widths/badge qtys):

Also tweaked some uneven spacing issues and allowed this button to expand in height to prevent overflow:

Only known issue is that the action tab becomes an empty box when you are on a channel that you're subscribed to and you go into mobile width territory:

It also fixes the visible bug at certain widths on all of the founders' channels:

Also changed the rewards edit icon color so it's not the only thing in the blue-grey palette: