fix(ci): match the screenshot checkbox by wording, not emphasis (#6073)

The PR-description check folded the template's asterisks into the pattern,
so a ticked box written without them read as unchecked while rendering
identically on the PR page. `ready for review` was silently withheld and
the bot reported missing visual evidence even with screenshots attached,
with no way to tell from the rendered PR what was wrong.

The two attestations directly above it already anchor on the wording
alone. This one now does the same, accepting `**bold**`, `*italic*`,
`__underscores__` and plain text.

Fixes #6071

.github/scripts/check-pr-description.js

@@ -96,7 +96,11 @@ module.exports = async ({ github, context, core }) => {
 
   const appRan = /- \[x\]\s+I actually ran the app\b/i.test(body);
   const appNotRun = /- \[x\]\s+I did not run the app\/runtime validation\b/i.test(body);
-  const screenshotChecked = /- \[x\]\s+\*\*Screenshot or short clip\*\*/i.test(body);
+  // Anchor on the wording, not the template's emphasis: a ticked box the author
+  // retyped without the surrounding ** renders identically on the PR page, so
+  // treating it as unchecked is invisible from their side. Matches the two
+  // attestations above, which already ignore formatting.
+  const screenshotChecked = /- \[x\]\s+[*_]{0,2}Screenshot or short clip[*_]{0,2}/i.test(body);
   const screenshotSection = section('Screenshots / clips');
   const hasVisualEvidence = /!\[[^\]]*\]\([^)]+\)|<(?:img|video|source)\b[^>]*(?:src|href)=|https?:\/\/[^\s)]+/i.test(screenshotSection);
   const evidenceGaps = [];