chore(deps): upgrade Rslint to v0.8.0

[chenjiahan]

Summary

• Upgrade @rslint/core to v0.8.0 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/v0.8.0

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Declare browser globals instead of disabling no-undef

When playground JavaScript contains a misspelled or otherwise undeclared identifier, this subtree-wide override makes lint pass because it disables no-undef merely to accommodate the browser-provided document used in playground/src/index.js. This removes recommended-rule coverage and allows broken demo code into CI; configure the browser global or narrowly suppress that specific use while retaining the rule.

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