fix: dis-sendable dmsg on overflow by click [D] in a follower's prof

on click [D] btn in follower's profile page:
* disable sending text on over 140 chars
* Tweetbox's [Tweet] btn transforms to [D] btn
dev: V.Button().node = [role=button][aria-pressed]

old | <button class="toggle false">
now | <button role="button" aria-pressed="false">