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/scripts/ScriptParameterField.tsx

@@ -93,7 +93,7 @@ export function ScriptParameterField({ param, value, error, disabled }: Props) {
         value={value}
         onChange={handleChange}
         disabled={disabled}
-        className="w-full rounded-[10px] border border-border bg-card text-foreground px-3 py-2 text-sm focus:outline-none focus:border-[rgba(6,182,212,0.3)] disabled:cursor-not-allowed disabled:opacity-50"
+        className="w-full rounded-[10px] border border-border bg-card text-foreground px-3 py-2 text-sm focus:outline-none focus:border-[rgba(249,115,22,0.3)] disabled:cursor-not-allowed disabled:opacity-50"
       >
         <option value="">Select…</option>
         {(param.options ?? []).map(opt => (