test: add unit tests for buildHtml and EmailTransport

[weaponsforge]

Summary

• Add build.test.ts — unit tests for buildHtml() covering paragraph content, WYSIWYG content, XSS script-tag stripping, and validation rejections (missing content, invalid sender, too many recipients)
• Add transport.test.ts — unit tests for EmailTransport covering initial null transporter state, pre-init error on getTransportOptions, invalid email rejection, and successful transporter creation with valid credentials

Test plan

• npm test passes with no failures
• Coverage report includes the new test files
• XSS stripping test confirms <script> tags are sanitized from WYSIWYG input
• Transport tests work with or without real OAuth2 env vars (fallback dummy values used)

Type of Change

• Other (please describe): new test cases

Checklist

• I have read the CONTRIBUTING.md
• My code follows the CODE STYLE of this project
• I have added tests where applicable
• I have tested my changes locally

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a0c92653-8b2d-404c-8b19-afcc769753d8

📥 Commits

Reviewing files that changed from the base of the PR and between 82f3018 and 8503f43.

📒 Files selected for processing (2)

• app/src/__tests__/build.test.ts
• app/src/__tests__/transport.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/test-scripts

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