fix: Handle CHANGELOG.md not in PR diff for inline suggestions

GitHub PR review comments API can only target files that are part of
the PR diff. When CHANGELOG.md is not modified in the PR, we cannot
create inline suggestions and must fall back to markdown instructions.

Changes:
- Check if changelogFile is in danger.git modified/created/deleted files
- Fall back to markdown instructions when file not in diff
- Add warning log explaining why inline suggestions cannot be used

This fixes the CI error: "could not be resolved" for pull_request_review_thread.path

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: vaind

danger/dangerfile.js

@@ -103,6 +103,21 @@ async function reportMissingChangelog(changelogFile) {
   const flavorConfig = getFlavorConfig(prFlavor);
   const sectionName = flavorConfig.changelog || "Features";
 
+  // Check if changelog file is part of the PR diff
+  // GitHub API can only create review comments on files that are modified in the PR
+  const allChangedFiles = danger.git.created_files
+    .concat(danger.git.modified_files)
+    .concat(danger.git.deleted_files);
+
+  const isChangelogInDiff = allChangedFiles.includes(changelogFile);
+
+  if (!isChangelogInDiff) {
+    // Cannot create inline suggestions on files not in the diff
+    console.log(`::warning::Cannot create inline suggestion: ${changelogFile} is not modified in this PR`);
+    showMarkdownInstructions(changelogFile, sectionName);
+    return;
+  }
+
   try {
     // Get changelog content
     const changelogContent = await danger.github.utils.fileContents(changelogFile);