fix: nested selectors with css modules.

[knightedcodemonkey]

• fixes Support nested selectors for CSS modules #142
• related to feat: nested selectors with lightningcss. css#92

[Copilot]

Pull request overview

This PR addresses CSS Modules nested selector support (Issue #142) by pinning the browser CSS runtime and its Lightning CSS WASM dependency to known-compatible versions, and adds an end-to-end regression test to ensure module nesting compiles cleanly in the UI.

Changes:

• Pin @knighted/css and @knighted/jsx CDN specifiers to fixed versions for consistent runtime behavior.
• Pin lightningcss-wasm to a verified version to avoid runtime transform option incompatibilities (e.g. drafts.nesting).
• Add a Playwright test ensuring CSS Modules nesting renders without style compilation failures/compatibility errors.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/modules/preview/render-runtime.js	Clarifies Lightning CSS WASM module initialization comment (no functional change).
src/modules/cdn.js	Pins CDN import specifiers for @knighted/css, @knighted/jsx, and lightningcss-wasm to prevent version drift/compat issues.
playwright/diagnostics.spec.ts	Adds regression coverage for CSS Modules nesting compilation without Lightning WASM compatibility errors.

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