Fix blog build + clear 14 dependabot advisories

Build was failing because the new MDX post tried to `import` the
SuchMoonLaunchStoreButtons component — next-mdx-remote/rsc doesn't
support imports inside .mdx; components must be passed via the
`components` prop. Wire the helper into [slug]/page.tsx and drop the
import line from the .mdx.

Dependency bumps to clear the 14 outstanding Dependabot advisories
(9 high, 4 moderate, 1 low):
- apps/web/next: ^15.5.15 → ^15.5.18 (covers 12 next.js advisories)
- pnpm overrides: pin postcss ^8.5.14 (clears 1117015 XSS via </style>)
- pnpm overrides: pin fast-uri ^3.1.2 (clears 1117870 + 1117884 path
  traversal / host confusion)

pnpm audit: 14 vulnerabilities → 0.

apps/web/src/app/blog/[slug]/page.tsx

@@ -5,6 +5,7 @@ import {
   VeganIqStoreButtons,
   SuchoiceStoreButtons,
   BauhausEchoStoreButtons,
+  SuchMoonLaunchStoreButtons,
 } from "@/components/store-buttons";
 import Link from "next/link";
 import type { Metadata } from "next";
@@ -69,6 +70,7 @@ export default async function BlogPost({ params }: Props) {
               VeganIqStoreButtons,
               SuchoiceStoreButtons,
               BauhausEchoStoreButtons,
+              SuchMoonLaunchStoreButtons,
             }} />
           </div>
         </div>