feat: shop buy, forum replies, tickets, messages, sessions, and UX hardening

Complete remaining product gaps: credit-based shop purchases, guild thread replies, help ticket detail/reply/close, offline message compose, sign-out-everywhere via JWT version, ads delete confirm, soft-fail feedback, rate limits, loading states, and single auth() in site layout.

Co-authored-by: Cursor <[email protected]>

src/app/(site)/guilds/[id]/forum/page.tsx

@@ -156,9 +156,12 @@ export default async function GuildForumPage({
 								return (
 									<tr key={t2.id}>
 										<td style={{ padding: "0.6rem 0.75rem" }}>
-											<span style={{ fontWeight: 700 }}>
+											<Link
+												href={`/guilds/${guild.id}/forum/${t2.id}`}
+												style={{ fontWeight: 700 }}
+											>
 												{t2.subject?.trim() || t("noSubject")}
-											</span>
+											</Link>
 											{t2.pinned ? (
 												<span
 													className="online-badge online"