fix: eliminate deprecated cyan, glass-border, and off-palette colors site-wide

- Replace all rgba(6,182,212,...) cyan focus borders and accents with
  rgba(249,115,22,...) ember orange across 21+ component files
- Remove all var(--glass-border) references (undefined variable) with
  var(--color-border-default) across 24 files
- Remove deprecated blur orbs and glass-morphism effects from
  SurveyPage, SurveyThankYouPage, and LoginPage
- Migrate landing.css from hardcoded hex to CSS custom properties
  (~97 replacements for single-source theming)
- Fix off-palette grays in FlowPilotAnalyticsPage chart styling
  (#8891a0 → #848b9b, #18191f → var(--color-bg-card))
- Update stale comments: "cyan brand" → "accent brand" in GlowEdge,
  "gradient cyan square" → "gradient orange square" in BrandLogo
- Rename glow-cyan SVG filter ID to glow-accent
- Fix category color comment: "cyan" → "deep orange"

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

frontend/src/components/script-builder/ScriptBuilderInput.tsx

@@ -44,7 +44,7 @@ export function ScriptBuilderInput({
   const canSend = value.trim().length > 0 && !disabled
 
   return (
-    <div className="flex items-end gap-2 p-3 border-t" style={{ borderColor: 'var(--glass-border)' }}>
+    <div className="flex items-end gap-2 p-3 border-t" style={{ borderColor: 'var(--color-border-default)' }}>
       <textarea
         ref={textareaRef}
         value={value}
@@ -56,7 +56,7 @@ export function ScriptBuilderInput({
         className={cn(
           "flex-1 resize-none rounded-xl px-4 py-2.5 text-sm",
           "bg-card border border-border text-foreground placeholder:text-muted-foreground",
-          "focus:outline-none focus:border-[rgba(6,182,212,0.3)] transition-colors",
+          "focus:outline-none focus:border-[rgba(249,115,22,0.3)] transition-colors",
           "disabled:opacity-50"
         )}
         style={{ maxHeight: 120 }}