QC-61: Mobile bottom nav + responsive audit

[DarshanCode2005]

Summary

Mobile bottom nav + responsive audit

Milestone: M7 UI Polish
Labels: frontend, design

Learn

• Bottom nav per role
• min 44px touch targets

Build

• Mobile bottom navigation for customer/owner/agent
• Full-screen chat on mobile
• Agent map full viewport

Files

• components/layout/MobileNav.tsx

Acceptance criteria

• Works on 375px width
• No horizontal overflow on main pages

Depends on

• QC-60: Framer motion variants library #62 (QC-60)