Fix invalid template tags in tests

[KirtiGautam620]

Issues Fixed

1. TypeScript incorrectly marked as JavaScript

File: standalone.test.ts (Line 125)

Problem:
A snippet referencing src/plugin.ts used the js template tag even though the content included TypeScript syntax (export interface PluginOptions {}).
This caused prettier-plugin-embed to attempt parsing TypeScript as JavaScript and fail.

Fix:

• Replaced js → ts template tag
• Added ts to imports from ../utils

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2. Invalid CSS parsed as actual CSS

File: index.test.ts (Lines 2595–2599)

Problem:
The test intentionally contains invalid CSS (*/ without an opening /*).
It was tagged with the css template tag, causing Prettier to try formatting it and crash.

Fix:

• Replaced css → txt template tag
• Added txt to imports from ../utils

---

Result

• Prettier lint checks now pass
• TypeScript code is formatted correctly
• Invalid CSS test no longer breaks formatting
• Test suite is more stable and consistent

[coderabbitai]

Walkthrough

This pull request includes formatting and import adjustments across documentation, test files, and type definitions. The README documentation syntax is updated to use standard Markdown heading syntax. Test files expand their utility imports to include txt and ts exports. A test case updates its template tag usage to align with the new imports. Additionally, an empty interface definition formatting is standardized to single-line syntax.

Pre-merge checks

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly relates to the changeset, detailing the two specific issues fixed (TypeScript marked as JavaScript and invalid CSS) with file locations and solutions.
Title check	✅ Passed	The title accurately describes the main fix: correcting invalid template tags in test files to resolve Prettier formatting issues.

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[KirtiGautam620]

Hii @RobinMalfait,
This PR corrects template tags in two test files (ts and txt), resolving Prettier failures without changing test behavior.
Please review when you have time. Thanks!