- Add responsive CSS classes for dashboard grid and metrics strip (3-col tablet, 2-col mobile, single-col stacking) - Fix QuickActions layout from vertical to horizontal per design ref - Replace non-existent var(--r-md) token with var(--r) in OrchestratorSessions and QuickActions - Fix NavItem borderRadius to var(--r-sm) matching reference - Fix ActivityFeed spacing (gap 12px, padding 10px per reference) - Refactor MetricsStrip to CSS class-based responsive grid Task: MS-P1-003 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>