fix: correct astro JSX patch target string for DSD SSR on MDX content

The patch search string was missing the closing paren from the case
expression, causing it to silently fail. This resulted in custom elements
authored in MDX files (all component previews) being rendered as plain
HTML without Declarative Shadow DOM templates.

DSD coverage: 72% -> 99% (1167/1617 -> 1788/1805 elements).

Author: piotrekwitkowski

scripts/patch-astro.mjs

@@ -2,14 +2,16 @@ import { readFileSync, writeFileSync } from 'node:fs';
 
 const file = 'node_modules/astro/dist/runtime/server/jsx.js';
 const content = readFileSync(file, 'utf8');
-const patched = content.replace(
-  'vnode.type !== ClientOnlyPlaceholder:',
-  "vnode.type !== ClientOnlyPlaceholder && !vnode.type.includes('-'):"
-);
 
-if (content === patched) {
-  console.log('⚠️  Astro patch target not found — may already be fixed or changed');
+const original = 'vnode.type !== ClientOnlyPlaceholder):';
+const replacement = "vnode.type !== ClientOnlyPlaceholder && !vnode.type.includes('-')):";
+
+if (content.includes(replacement)) {
+  console.log('astro/jsx: patch already applied');
+} else if (content.includes(original)) {
+  writeFileSync(file, content.replace(original, replacement));
+  console.log('astro/jsx: patch applied');
 } else {
-  writeFileSync(file, patched);
-  console.log('✅ Patched astro JSX handler for custom element hydration');
+  console.error('astro/jsx: patch failed — target string not found');
+  process.exit(1);
 }