chore(deps): upgrade Rslint to v0.8.1

[chenjiahan]

Summary

• Upgrade @rslint/core to v0.8.1 and refresh the lockfile where applicable.
• Preserve the existing recommended-rule coverage under Rslint 0.8.
• Resolve newly surfaced lint diagnostics where needed.
• Verify the relevant lint checks pass.

Related Links

• https://github.com/web-infra-dev/rslint/releases/tag/v0.8.1

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve no-undef checks for browser code

Disabling no-undef for the entire playground means future undeclared identifiers and browser-global typos will pass the repository's only lint check; currently, document is the specific browser global triggering this exception. Declare the required browser globals (or just document) in the scoped configuration instead of suppressing the rule, so actual undefined references remain detectable.

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