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/common/BrandLogo.tsx

@@ -6,7 +6,7 @@ interface BrandLogoProps {
 }
 
 /**
- * Brand logo mark: gradient cyan square with rounded corners
+ * Brand logo mark: gradient orange square with rounded corners
  * containing a white lightning bolt.
  */
 export function BrandLogo({ size = 'sm', className }: BrandLogoProps) {

frontend/src/components/common/RichTextInput.tsx

@@ -234,7 +234,7 @@ export function RichTextInput({
         disabled={disabled}
         className={cn(
           'w-full bg-card border border-border rounded-xl p-3 text-sm text-foreground placeholder:text-muted-foreground',
-          'focus:border-[rgba(6,182,212,0.3)] focus:outline-none resize-none transition-colors',
+          'focus:border-[rgba(249,115,22,0.3)] focus:outline-none resize-none transition-colors',
           isDragOver && 'border-primary/50 bg-primary/5',
           disabled && 'opacity-50 cursor-not-allowed'
         )}