feat(card): detail page with checklist, comments and history

src/app/p/[clientSlug]/[projectSlug]/c/[cardId]/page.tsx

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+import Link from "next/link";
+import { notFound, redirect } from "next/navigation";
+import { ArrowLeft } from "lucide-react";
+
+import { AppShell } from "@/components/shell/app-shell";
+import { TopBar } from "@/components/shell/top-bar";
+import { CardHeader } from "@/components/card/card-header";
+import { CardActions } from "@/components/card/card-actions";
+import { SubtaskList } from "@/components/card/subtask-list";
+import { CommentThread } from "@/components/card/comment-thread";
+import { ActivityTimeline } from "@/components/card/activity-timeline";
+import { Pill } from "@/components/ui/pill";
+import { getSession } from "@/lib/auth/session";
+import { loadCardDetail } from "@/lib/data/card";
+
+export default async function CardPage({
+  params,
+}: {
+  params: Promise<{ clientSlug: string; projectSlug: string; cardId: string }>;
+}) {
+  const session = await getSession();
+  if (!session) redirect("/login");
+
+  const { clientSlug, projectSlug, cardId } = await params;
+  const detail = await loadCardDetail(clientSlug, projectSlug, cardId);
+  if (!detail) notFound();
+
+  const isOwner = session.role === "owner";
+  const boardHref = `/p/${clientSlug}/${projectSlug}`;
+
+  return (
+    <AppShell role={session.role} currentPath={boardHref}>
+      <TopBar title={detail.project.name} subtitle={detail.client.name}>
+        {isOwner && (
+          <CardActions
+            card={detail.card}
+            clientSlug={clientSlug}
+            projectSlug={projectSlug}
+          />
+        )}
+      </TopBar>
+
+      <div className="flex-1 overflow-y-auto">
+        <div className="mx-auto max-w-3xl space-y-8 p-6">
+          <div className="flex items-center gap-3">
+            <Link
+              href={boardHref}
+              className="inline-flex items-center gap-1.5 text-xs text-text-muted hover:text-text-secondary"
+            >
+              <ArrowLeft size={13} strokeWidth={2} />
+              Back to board
+            </Link>
+            <Pill tone="neutral">{detail.column.name}</Pill>
+            {!detail.card.accepted &&
+              detail.card.created_by_role === "client" && (
+                <Pill tone="brand">Requested</Pill>
+              )}
+          </div>
+
+          <CardHeader
+            card={detail.card}
+            editable={isOwner}
+            clientSlug={clientSlug}
+            projectSlug={projectSlug}
+          />
+
+          <SubtaskList
+            cardId={detail.card.id}
+            subtasks={detail.subtasks}
+            editable={isOwner}
+            clientSlug={clientSlug}
+            projectSlug={projectSlug}
+          />
+
+          <CommentThread
+            cardId={detail.card.id}
+            comments={detail.comments}
+            names={detail.names}
+            role={session.role}
+            clientSlug={clientSlug}
+            projectSlug={projectSlug}
+          />
+
+          <ActivityTimeline activity={detail.activity} names={detail.names} />
+        </div>
+      </div>
+    </AppShell>
+  );
+}

src/components/card/card-actions.tsx

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+"use client";
+
+import { useTransition } from "react";
+import { useRouter } from "next/navigation";
+import { Check, Archive } from "lucide-react";
+
+import { acceptCard, archiveCard } from "@/app/actions/cards";
+import type { CardRecord } from "@/lib/pb/types";
+
+export function CardActions({
+  card,
+  clientSlug,
+  projectSlug,
+}: {
+  card: CardRecord;
+  clientSlug: string;
+  projectSlug: string;
+}) {
+  const router = useRouter();
+  const [pending, startTransition] = useTransition();
+
+  const showAccept = !card.accepted && card.created_by_role === "client";
+
+  return (
+    <div className="flex items-center gap-2">
+      {showAccept && (
+        <button
+          type="button"
+          disabled={pending}
+          onClick={() =>
+            startTransition(() =>
+              acceptCard({ cardId: card.id, clientSlug, projectSlug }).then(() =>
+                router.push(`/p/${clientSlug}/${projectSlug}`)
+              )
+            )
+          }
+          className="inline-flex items-center gap-1.5 rounded-lg bg-brand px-3 py-1.5 text-sm font-medium text-brand-fg transition-colors hover:bg-brand-hover disabled:opacity-50"
+        >
+          <Check size={14} strokeWidth={2} />
+          Accept request
+        </button>
+      )}
+
+      <button
+        type="button"
+        disabled={pending}
+        onClick={() =>
+          startTransition(() =>
+            archiveCard({ cardId: card.id, clientSlug, projectSlug }).then(() =>
+              router.push(`/p/${clientSlug}/${projectSlug}`)
+            )
+          )
+        }
+        className="inline-flex items-center gap-1.5 rounded-lg border border-border-subtle px-3 py-1.5 text-sm font-medium text-text-secondary transition-colors hover:bg-surface-raised disabled:opacity-50"
+      >
+        <Archive size={14} strokeWidth={2} />
+        Archive
+      </button>
+    </div>
+  );
+}

src/components/card/card-header.tsx

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+"use client";
+
+import { useState, useTransition } from "react";
+
+import { updateCard } from "@/app/actions/cards";
+import type { CardRecord } from "@/lib/pb/types";
+
+/**
+ * Title and description.
+ *
+ * Editable in place for the owner, read-only for a client manager. The client
+ * may not change these — their two editable fields are priority and target
+ * date, which live on the board tile and go through /api/client/*.
+ */
+export function CardHeader({
+  card,
+  editable,
+  clientSlug,
+  projectSlug,
+}: {
+  card: CardRecord;
+  editable: boolean;
+  clientSlug: string;
+  projectSlug: string;
+}) {
+  const [pending, startTransition] = useTransition();
+  const [title, setTitle] = useState(card.title);
+  const [description, setDescription] = useState(card.description);
+
+  function saveTitle() {
+    if (title.trim() === card.title || !title.trim()) {
+      setTitle(card.title);
+      return;
+    }
+    startTransition(() =>
+      updateCard({ cardId: card.id, title, clientSlug, projectSlug }).then(
+        () => undefined
+      )
+    );
+  }
+
+  function saveDescription() {
+    if (description === card.description) return;
+    startTransition(() =>
+      updateCard({ cardId: card.id, description, clientSlug, projectSlug }).then(
+        () => undefined
+      )
+    );
+  }
+
+  if (!editable) {
+    return (
+      <div className="space-y-3">
+        <h1 className="text-xl font-semibold tracking-tight text-text-primary">
+          {card.title}
+        </h1>
+        {card.description ? (
+          <p className="whitespace-pre-wrap text-sm text-text-secondary">
+            {card.description}
+          </p>
+        ) : (
+          <p className="text-sm text-text-muted">No description yet.</p>
+        )}
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-3">
+      <input
+        value={title}
+        onChange={(event) => setTitle(event.target.value)}
+        onBlur={saveTitle}
+        disabled={pending}
+        aria-label="Card title"
+        className="w-full rounded-lg bg-transparent text-xl font-semibold tracking-tight text-text-primary outline-none hover:bg-surface focus:bg-surface"
+      />
+      <textarea
+        value={description}
+        onChange={(event) => setDescription(event.target.value)}
+        onBlur={saveDescription}
+        disabled={pending}
+        rows={5}
+        placeholder="Add a description"
+        aria-label="Card description"
+        className="w-full rounded-[var(--radius-tile)] bg-transparent p-2 text-sm text-text-secondary outline-none placeholder:text-text-muted hover:bg-surface focus:bg-surface"
+      />
+    </div>
+  );
+}