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- Create tests/e2e/mobile/mobile-layout.spec.ts with 8 tests covering AppBar/hamburger visibility, drawer open/close, mobile card rendering, PageHeader button layout, dialog width, card actions, and analytics overflow. - Fix AnalyticsClient: make Autocomplete full-width on mobile, add overflow:hidden to outer Stack to prevent body scrollWidth growth. - Fix WorldMapInner: remove hard-coded minWidth:400 that caused 73px horizontal overflow on 393px iPhone 15 viewport. - Fix DashboardLayoutClient: add overflowX:hidden to main content area to contain chart library elements that exceed viewport width. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>