Season Check: series card, study guide, next-season handover and unseasoned-script checks; v2.20.1

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/components/AdminDashboardExtras.tsx

@@ -4,7 +4,7 @@ interface Trend { thisWeek: number; lastWeek: number; series: number[] }
 interface ResendStatus { available: boolean; reason?: string; broadcast?: { id: string; name: string; subject: string; sentAt: string | null; dashboardUrl: string } | null }
 
 export interface DashboardData {
-  seasonCheck: { total: number; errors: number; warnings: number; lanes: { lane: string; title: string; season: string; errors: number; warnings: number }[] } | null
+  seasonCheck: { total: number; errors: number; warnings: number; general: number; lanes: { lane: string; title: string; season: string; errors: number; warnings: number }[] } | null
   trends: { visits: Trend; subscribers: Trend; studySignups: Trend }
   traffic: { topPages: { path: string; hits: number }[]; topReferrers: { referrer: string; count: number }[] }
   reengagement: { t1: number; t2: number; t3: number; recentlySent: number; remindersEnabled: number }
@@ -157,6 +157,9 @@ export function AdminDashboardExtras({ publishedAt, draftUpdatedAt, isDirty, onN
                   )
                 })}
               </div>
+              {data.seasonCheck.general > 0 && (
+                <p className="admin-stats-note">Plus {data.seasonCheck.general} thing{data.seasonCheck.general === 1 ? '' : 's'} that apply to every lane (such as scripts with no season number).</p>
+              )}
             </>
           )}