feat: replace all hardcoded orange rgba with blue rgba

Mechanical find-and-replace: rgba(249,115,22,...) → rgba(96,165,250,...)
across ~40 component and page files.

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(249,115,22,0.3)] focus:outline-none',
+        'focus:border-[rgba(96,165,250,0.3)] 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(249,115,22,0.3)] focus:outline-none',
+            'focus:border-[rgba(96,165,250,0.3)] 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(249, 115, 22, 0.1)',
+            borderTop: '1px solid rgba(96, 165, 250, 0.1)',
           }}
         >
           <div className="grid grid-cols-1 gap-3 md:grid-cols-2">
@@ -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(249, 115, 22, 0.08)', border: '1px solid rgba(249, 115, 22, 0.15)' }}
+          style={{ background: 'rgba(96, 165, 250, 0.08)', border: '1px solid rgba(96, 165, 250, 0.15)' }}
         >
           <span className="text-sm text-primary font-medium">
             {selectedIds.size} selected