The chat window fits the screen, and the header stops asking questions

The message log had a fixed 62vh height, so the card was head + panels +
log + composer tall and the input fell off the bottom of the screen. The
card is now sized to the viewport and the log is the only part that
flexes: opening the invite or member panel shrinks the scroll area
instead of pushing the composer out of reach.

Three header changes, all the same idea — don't show a control for a
choice nobody is making:

  '+' becomes 'Add person', because a plus sign doesn't say what it adds.

  A lone channel isn't named at all. '#general' next to a composer that
  says 'Message #general' points at a choice of one; several channels
  become a select, which is what a choice looks like.

  The new-channel field hides behind a 'New channel' button. Sitting open
  right after you create a community, it reads as something you're
  supposed to fill in.

tools/chat-layout-test.js holds the line at three viewport sizes with
both panels open, and covers the header behaviour through actually
adding a second channel.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Wvj4aoeMZwA7VUGdJP9Swi

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