refactor: replace cyan accent with ember orange across entire frontend

Swap accent color from cyan (#22d3ee) to ember orange (#f97316) site-wide.
Cyan caused contrast issues and felt generic — orange brings warmth and
urgency fitting for a troubleshooting tool.

Changes:
- CSS variables: accent, accent-hover, accent-dim, accent-text, primary, ring
- Warning color shifted from amber (#fbbf24) to yellow (#eab308) for
  semantic separation from orange accent
- Brand SVGs: logo gradient updated to orange
- 50+ component files: all hardcoded cyan hex values, Tailwind cyan-*
  classes, and rgba(34,211,238,...) glow values replaced
- landing.css: all 45+ cyan references + 5 old border color fixes
- DESIGN-SYSTEM.md bumped to v5 with decisions log
- CLAUDE.md: all color references synced to charcoal palette + orange accent
- PWA theme-color meta tag updated to match sidebar (#10121a)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/dashboard/PerformanceCards.tsx

@@ -45,7 +45,7 @@ export function PerformanceCards() {
       label: 'Avg Resolution',
       value: avgMttr > 0 ? `${avgMttr}m` : '\u2014',
       icon: Clock,
-      iconColor: '#22d3ee',
+      iconColor: '#f97316',
       href: '/analytics',
     },
     {
@@ -59,7 +59,7 @@ export function PerformanceCards() {
       label: 'Session Time',
       value: totalMinutes > 0 ? `${totalMinutes}m` : '\u2014',
       icon: Timer,
-      iconColor: '#fbbf24',
+      iconColor: '#eab308',
       href: '/analytics',
     },
   ]