Update how to find first HTML file from AI tutor code response

[fisher-alice]

This updates how to find the first HTML file from the AI tutor code response by just checking if the file name ends with '.html' instead of using file.language which is currently not always accurate (this will be fixed soon by https://codedotorg.atlassian.net/browse/AFL-414).

I also removed the required language for the AI tutor response code since we don't currently use it to update or generate new project files. We just use the file name's file extension.

Before update

After update

Links

• Slack thread

Testing story

Tested locally on weblab2 level '/courses/artificial-intelligence-foundations-semester2-2025/units/1/lessons/1/levels/2'

Deployment strategy

Follow-up work

Privacy

Security

Caching

PR Creation Checklist:

• Tests provide adequate coverage
• Privacy impacts have been documented
• Security impacts have been documented
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Follow-up work items (including potential tech debt) are tracked and linked

[molly-moen]

do we rely on language when merging the generated files into the project?

[fisher-alice]

No - should've included the code references in PR description!

When updating existing active file:

code-dot-org/apps/src/weblab2/helpers/aiTutorStructuredResponseHelper.ts

Lines 281 to 284 in 6090d01

	const aiTutorVersionFile: ProjectFile = {
	...updatedSource.files[activeFile.id],
	contents: aiFile.contents,
	isAiTutorVersionUpdated: true,

When updating existing non-active file:

code-dot-org/apps/src/weblab2/helpers/aiTutorStructuredResponseHelper.ts

Lines 296 to 299 in 6090d01

	updatedSource.files[matchingFiles[0].id] = {
	...matchingFiles[0],
	contents: aiFile.contents,
	isAiTutorVersionUpdated: true,

When generating new file:

code-dot-org/apps/src/weblab2/helpers/aiTutorStructuredResponseHelper.ts

Line 328 in 6090d01

language: aiFile.name.split('.').pop() || '',