fix(e2e): harden card selectors for session resume

Co-Authored-By: Codex <noreply@openai.com>

frontend/src/pages/MySharesPage.tsx

@@ -161,7 +161,12 @@ export default function MySharesPage() {
             const isCopied = copiedId === share.id
 
             return (
-              <div key={share.id} className="bg-card border border-border rounded-xl p-5">
+              <div
+                key={share.id}
+                data-testid="share-card"
+                data-share-id={share.id}
+                className="bg-card border border-border rounded-xl p-5"
+              >
                 {/* Top row: badge + name */}
                 <div className="flex items-center gap-3 mb-3">
                   <span className="inline-flex items-center gap-1.5 text-xs rounded-full px-2 py-0.5 bg-accent text-muted-foreground">