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/components/settings/BrandingSettings.tsx

@@ -154,7 +154,7 @@ export function BrandingSettings({ teamId }: BrandingSettingsProps) {
             className={cn(
               'mt-2 w-full max-w-md rounded-md border border-border bg-card px-3 py-2 text-sm',
               'text-foreground placeholder:text-muted-foreground',
-              'focus:border-[rgba(249,115,22,0.3)] focus:outline-hidden focus:ring-1 focus:ring-primary/20'
+              'focus:border-[rgba(96,165,250,0.3)] focus:outline-hidden focus:ring-1 focus:ring-primary/20'
             )}
           />
         </div>