ccshare 0.3.0 - join from a browser

• Join from a browser. The host now serves an xterm.js terminal page on its
  session port, so the tunnel URL doubles as a no-install join link:
  https://random-words.trycloudflare.com/#CODE (or http://lan-ip:port/#CODE on
  the same network). Full live terminal in the browser - phone included - same
  replay, typing, and resize behavior as the CLI joiner. The link shows in the
  banner, the menu bar, and ccshare code.
• ccshare host --approve. Each joiner waits until you click Allow in a macOS
  dialog; deny and they're told the host declined. Enforced for direct/LAN/tunnel
  joiners (their input is dropped until admitted), best-effort over a relay (input
  frames there aren't attributed per joiner). ccshare setup can make it the
  default; --no-approve skips it per session.
• ccshare host --record. Saves the session as an asciinema v2 .cast file in
  the project directory (output and resizes, timestamped). Writes are synchronous
  appends, so even a SIGTERM keeps the tail.
• Menu bar, rounder. Copy-browser-link row; "open anywhere link" starts the
  tunnel on a lan-only session right from the menu; "end session" stops a host
  cleanly (same path as ccshare stop); the status title shows how many friends
  are connected; copying flashes "copied ✓"; you get a notification when someone
  leaves (with their name), not just when they join; recording and view-only
  sessions are labeled.