Fix docs pages overflowing horizontally on mobile

GFM tables (config reference's Field/Type/Default/Notes tables) are
wider than a phone screen and don't wrap, so without their own scroll
container they forced the whole page to scroll horizontally instead.
Wrap rendered tables in an overflow-x-auto div, and let long unbroken
strings in table cells and inline code (env var names, paths) break
instead of forcing extra width.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/(app)/not-found.tsx

@@ -0,0 +1,5 @@
+import { NotFoundContent } from "@/components/layout/not-found-content";
+
+export default function NotFound() {
+  return <NotFoundContent />;
+}

src/app/not-found.tsx

@@ -0,0 +1,5 @@
+import { NotFoundContent } from "@/components/layout/not-found-content";
+
+export default function NotFound() {
+  return <NotFoundContent />;
+}

src/components/docs/markdown-viewer.tsx

@@ -2,6 +2,19 @@ import ReactMarkdown from "react-markdown";
 import remarkGfm from "remark-gfm";
 import { cn } from "@/lib/utils";
 
+// GFM tables (the config reference's Field/Type/Default/Notes tables) are wider than a phone
+// screen and don't wrap - without their own scroll container the table forces the whole page
+// to scroll horizontally instead. The typography plugin's table styles still apply to `table`
+// here (its selectors match any descendant, not just direct children of `.prose`), so this
+// wrapper only adds the scroll boundary.
+function Table(props: React.ComponentProps<"table">) {
+  return (
+    <div className="overflow-x-auto">
+      <table {...props} />
+    </div>
+  );
+}
+
 export function MarkdownViewer({ content }: { content: string }) {
   return (
     <div
@@ -13,9 +26,14 @@ export function MarkdownViewer({ content }: { content: string }) {
         // elsewhere in the app (see the "no scripts configured" message on the dashboard).
         "prose-code:before:content-none prose-code:after:content-none",
         "prose-code:rounded prose-code:bg-muted prose-code:px-1.5 prose-code:py-0.5 prose-code:font-mono prose-code:font-normal prose-code:text-foreground",
+        // Long unbroken strings (env var names, paths) in table cells or inline code would
+        // otherwise force their column/line wider than the viewport instead of wrapping.
+        "prose-td:break-words prose-th:break-words prose-code:break-words",
       )}
     >
-      <ReactMarkdown remarkPlugins={[remarkGfm]}>{content}</ReactMarkdown>
+      <ReactMarkdown remarkPlugins={[remarkGfm]} components={{ table: Table }}>
+        {content}
+      </ReactMarkdown>
     </div>
   );
 }

src/components/layout/not-found-content.tsx

@@ -0,0 +1,29 @@
+import Link from "next/link";
+import { Home } from "lucide-react";
+import { buttonVariants } from "@/components/ui/button";
+import { cn } from "@/lib/utils";
+
+export function NotFoundContent() {
+  return (
+    <div className="mx-auto flex max-w-md flex-col items-center gap-3 py-24 text-center">
+      <span className="text-primary font-mono text-6xl font-semibold tracking-tight">
+        404
+      </span>
+      <h1 className="font-heading text-xl font-medium">Page not found</h1>
+      <p className="text-muted-foreground text-sm">
+        The page you&rsquo;re looking for doesn&rsquo;t exist or may have been
+        moved.
+      </p>
+      <Link
+        href="/"
+        className={cn(
+          buttonVariants({ variant: "outline", size: "sm" }),
+          "mt-2",
+        )}
+      >
+        <Home className="size-3.5" />
+        Back to dashboard
+      </Link>
+    </div>
+  );
+}