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/flowpilot/FlowPilotOptions.tsx

@@ -29,7 +29,7 @@ export function FlowPilotOptions({ options, onSelect, disabled }: FlowPilotOptio
             disabled={disabled}
             className={cn(
               'group relative rounded-xl border p-3 sm:p-4 text-left transition-all min-h-[44px]',
-              'hover:border-[rgba(6,182,212,0.3)] hover:shadow-[0_0_20px_rgba(6,182,212,0.08)]',
+              'hover:border-[rgba(249,115,22,0.3)] hover:shadow-[0_0_20px_rgba(249,115,22,0.08)]',
               'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/40',
               isSelected
                 ? 'border-primary/40 bg-accent-dim'