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/pages/admin/GalleryManagementPage.tsx

@@ -90,7 +90,7 @@ function SortOrderInput({
       }}
       className={cn(
         'w-20 rounded-[8px] border border-border bg-card px-2 py-1 text-sm text-foreground',
-        'focus:border-[rgba(6,182,212,0.3)] focus:outline-none',
+        'focus:border-[rgba(249,115,22,0.3)] focus:outline-none',
         disabled && 'cursor-not-allowed opacity-50',
       )}
     />
@@ -125,7 +125,7 @@ function FilterBar({
           onChange={e => onSearchChange(e.target.value)}
           className={cn(
             'w-full rounded-lg border border-border bg-card pl-9 pr-3 py-2 text-sm text-foreground placeholder:text-muted-foreground',
-            'focus:border-[rgba(6,182,212,0.3)] focus:outline-none',
+            'focus:border-[rgba(249,115,22,0.3)] focus:outline-none',
           )}
         />
       </div>

frontend/src/pages/admin/SurveyResponsesPage.tsx

@@ -91,7 +91,7 @@ function ExpandedDetail({ response }: { response: SurveyResponseDetail }) {
           className="px-6 py-5"
           style={{
             background: 'rgba(0, 0, 0, 0.15)',
-            borderTop: '1px solid rgba(6, 182, 212, 0.1)',
+            borderTop: '1px solid rgba(249, 115, 22, 0.1)',
           }}
         >
           <div className="grid grid-cols-1 gap-3 md:grid-cols-2">
@@ -101,7 +101,7 @@ function ExpandedDetail({ response }: { response: SurveyResponseDetail }) {
                 className="rounded-lg p-4"
                 style={{
                   background: 'var(--color-bg-card)',
-                  border: '1px solid var(--glass-border)',
+                  border: '1px solid var(--color-border-default)',
                 }}
               >
                 <p className="font-sans text-xs text-[0.625rem] uppercase tracking-widest text-primary mb-1">
@@ -223,7 +223,7 @@ function ResponseRow({
               <div className="fixed inset-0 z-40" onClick={() => setShowMenu(false)} />
               <div
                 className="absolute right-3 top-full z-50 mt-1 w-44 rounded-xl py-1 shadow-xl"
-                style={{ background: 'var(--color-bg-card)', border: '1px solid var(--glass-border)', }}
+                style={{ background: 'var(--color-bg-card)', border: '1px solid var(--color-border-default)', }}
               >
                 <button
                   onClick={() => { onMarkRead(); setShowMenu(false) }}
@@ -239,7 +239,7 @@ function ResponseRow({
                   {response.archived_at ? <ArchiveRestore className="h-3.5 w-3.5" /> : <Archive className="h-3.5 w-3.5" />}
                   {response.archived_at ? 'Unarchive' : 'Archive'}
                 </button>
-                <div className="my-1 border-t" style={{ borderColor: 'var(--glass-border)' }} />
+                <div className="my-1 border-t" style={{ borderColor: 'var(--color-border-default)' }} />
                 <button
                   onClick={() => { onDelete(); setShowMenu(false) }}
                   className="flex w-full items-center gap-2.5 px-3 py-2 text-xs text-rose-400 hover:bg-rose-500/10 transition-colors"
@@ -500,7 +500,7 @@ export default function SurveyResponsesPage() {
       {selectedIds.size > 0 && (
         <div
           className="flex items-center gap-3 rounded-xl px-4 py-2.5"
-          style={{ background: 'rgba(6, 182, 212, 0.08)', border: '1px solid rgba(6, 182, 212, 0.15)' }}
+          style={{ background: 'rgba(249, 115, 22, 0.08)', border: '1px solid rgba(249, 115, 22, 0.15)' }}
         >
           <span className="text-sm text-primary font-medium">
             {selectedIds.size} selected