Add a delete button on the session detail view

Same confirm-dialog delete UX as the sessions table, next to Replay in
the header. Deleting redirects back to /sessions since the session no
longer exists.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WzyfRyA7h5rs5SCAahLAWd

app/(app)/sessions/[id]/page.tsx

@@ -7,6 +7,7 @@ import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import { SessionTimelineChart } from "@/components/sessions/SessionTimelineChart";
 import { SessionTitleEditor } from "@/components/sessions/SessionTitleEditor";
 import { SessionDescriptionEditor } from "@/components/sessions/SessionDescriptionEditor";
+import { SessionDeleteButton } from "@/components/sessions/SessionDeleteButton";
 import { STATUS_VARIANT } from "@/components/sessions/session-status";
 import { getSessionDetail, getSessionName } from "@/lib/db/queries/sessions";
 import { getSessionTimeline } from "@/lib/db/queries/stats";
@@ -65,6 +66,7 @@ export default async function SessionDetailPage({ params }: { params: Promise<{
               </Link>
             </Button>
           )}
+          <SessionDeleteButton sessionId={detail.session.id} sessionName={detail.session.name} />
         </div>
       </div>
 

components/sessions/SessionDeleteButton.tsx

@@ -0,0 +1,63 @@
+"use client";
+
+import { useState } from "react";
+import { useRouter } from "next/navigation";
+import { Button } from "@/components/ui/button";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { Trash2 } from "lucide-react";
+import { toast } from "sonner";
+
+export function SessionDeleteButton({ sessionId, sessionName }: { sessionId: number; sessionName: string | null }) {
+  const router = useRouter();
+  const [open, setOpen] = useState(false);
+  const [deleting, setDeleting] = useState(false);
+
+  async function handleDelete() {
+    setDeleting(true);
+    const res = await fetch(`/api/sessions/${sessionId}`, { method: "DELETE" });
+    setDeleting(false);
+    if (res.ok) {
+      toast.success("Session deleted");
+      router.push("/sessions");
+      router.refresh();
+    } else {
+      toast.error("Could not delete session");
+    }
+  }
+
+  return (
+    <>
+      <Button variant="ghost" size="icon-sm" onClick={() => setOpen(true)} aria-label="Delete session">
+        <Trash2 className="size-4" />
+      </Button>
+
+      <Dialog open={open} onOpenChange={setOpen}>
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>Delete session?</DialogTitle>
+            <DialogDescription>
+              This permanently deletes{" "}
+              <span className="font-medium text-foreground">{sessionName ?? `Session #${sessionId}`}</span> and all
+              of its recorded events. This can&apos;t be undone.
+            </DialogDescription>
+          </DialogHeader>
+          <DialogFooter>
+            <Button variant="ghost" onClick={() => setOpen(false)}>
+              Cancel
+            </Button>
+            <Button variant="destructive" onClick={() => void handleDelete()} disabled={deleting}>
+              {deleting ? "Deleting..." : "Delete"}
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+    </>
+  );
+}