chore: replace em dashes with hyphens, add no-em-dash rule to CLAUDE.md

web/components/status/ComponentRow.tsx

@@ -9,7 +9,7 @@ const LABEL: Record<string, string> = {
     no_data: "Unknown",
 };
 
-// A component under maintenance is drawn as maintenance, never as down — but
+// A component under maintenance is drawn as maintenance, never as down - but
 // its uptime figure (below) is left untouched. The window changes how a
 // component is drawn, never what the numbers say; see
 // applyMaintenanceRepaint in statussnapshot.go.

web/components/status/HistoryBar.tsx

@@ -1,7 +1,7 @@
 import type { PublicDay } from "@/lib/api";
 
 // The no-data tail (a component created less recently than 90 days ago) reads
-// as grey rather than as uptime — see uptimeFromDays in
+// as grey rather than as uptime - see uptimeFromDays in
 // server/internal/services/statussnapshot.go, which skips these days rather
 // than counting them as zero. Painting them the same as "up" here would undo
 // that on the one screen a reader actually looks at.

web/components/status/IncidentCard.tsx

@@ -33,7 +33,7 @@ export default function IncidentCard({ incident }: { incident: PublicIncident })
                     <p className="mt-1 text-xs text-text-secondary">
                         {new Date(incident.started_at).toLocaleString()}
                         {incident.resolved_at
-                            ? ` — resolved ${new Date(incident.resolved_at).toLocaleString()}`
+                            ? ` - resolved ${new Date(incident.resolved_at).toLocaleString()}`
                             : ""}
                     </p>
                 </div>