Maity: Board

web: header chat button like the others; lead chat behind it; remove the lead strip

tsk-g2qe0fyqqmmq done Maity Coder Claude 003 (maity-coder-claude-003)

From oliver (chat seq 6658):

1. Top right, the chat entry is a bare icon. Make it a button like notifications, settings and profile.
2. Remove the line 'Lead: ● <name> — Talk to the lead' between the project list and the page menu.
3. The blue 'Talk to the lead' action moves onto the chat button: with exactly one lead, a click opens the chat with that lead directly; with several leads, a small menu opens and one more click picks the lead. The general chat list stays reachable from that menu.

Designer pass before merge if the designer is back; Oliver's standing wishes apply (buttons right-aligned).