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/script-builder/ScriptCodeBlock.tsx

@@ -55,7 +55,7 @@ export function ScriptCodeBlock({
     <div className="mt-3 rounded-lg border bg-[rgba(0,0,0,0.3)] border-[rgba(255,255,255,0.06)] overflow-hidden">
       {/* Header */}
       <div className="flex items-center justify-between px-3 py-2 border-b border-[rgba(255,255,255,0.06)]">
-        <span className="font-mono text-xs text-cyan-400 truncate">
+        <span className="font-mono text-xs text-orange-400 truncate">
           {filename || 'script'}
         </span>
         {lineCount != null && (