Adds a Profiles button as the last item in the mobile bottom nav bar,
making the Profiles panel reachable on mobile without opening the sidebar.
Fixes from original PR:
- Uses mobileSwitchPanel('profiles') not the broken two-call approach
- data-panel='profiles' attribute present for active-highlight state
- SVG 20x20 stroke-width 1.5 matching all other mobile nav icons
- Placed last (Chat → Tasks → Skills → Memory → Spaces → Profiles)
- 3 new tests in test_mobile_layout.py covering presence, handler, and order
Tests: 700 passed (up from 697)
Co-authored-by: @gabogabucho
Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>
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