feat: replace orange-* Tailwind classes with blue-* equivalents

orange-400→blue-400, orange-500→blue-500, orange-600→blue-600
across ~21 component files.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/session/TicketLinkIndicator.tsx

@@ -36,7 +36,7 @@ export function TicketLinkIndicator({ session, hasConnection, onLinkClick, onUnl
   // Ticket linked
   return (
     <div className="card-flat inline-flex items-start gap-2.5 rounded-lg border border-border px-3 py-2">
-      <Ticket className="mt-0.5 h-4 w-4 shrink-0 text-orange-400" />
+      <Ticket className="mt-0.5 h-4 w-4 shrink-0 text-blue-400" />
       <div className="min-w-0">
         <p className="text-sm font-medium text-foreground">
           CW #{session.psa_ticket_id}

frontend/src/components/session/UpdateTicketModal.tsx

@@ -259,7 +259,7 @@ export function UpdateTicketModal({ open, onClose, sessionId, onPosted }: Props)
                       value={opt.value}
                       checked={noteType === opt.value}
                       onChange={() => setNoteType(opt.value)}
-                      className="mt-0.5 accent-orange-400"
+                      className="mt-0.5 accent-blue-400"
                     />
                     <div className="min-w-0">
                       <span className="text-sm font-medium text-foreground">{opt.label}</span>