docs: sync page tabs implementation plan — 7 tasks

Step-by-step plan covering: strip Overview, create TeamTab from
MembersTab, enhance ProjectRow with gap indicators, refocus Activity
on session-level events, clean up imports, pass server data through,
and integration testing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: JayantDevkar