chore: replace biome with prettier and rslint

[chenjiahan]

Summary

• Replace the root Biome setup with Prettier, Rslint, and simple-git-hooks.
• Update the root lint scripts, editor recommendations, and example files that still used Biome-specific directives.

Related Links

• None

[Copilot]

Pull request overview

This PR migrates the repo’s root formatting/linting and git-hook setup away from Biome and onto Prettier, Rslint, and simple-git-hooks.

Changes:

• Add Prettier configuration (.prettierrc, .prettierignore) and a new rslint.config.ts.
• Update root tooling scripts and hooks in package.json (including replacing Husky with simple-git-hooks).
• Remove Biome config and clean up some Biome-specific ignore directives and editor recommendations.

Reviewed changes

Copilot reviewed 11 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
rstest/rspack-adapter/tests/rstest.setup.ts	Removes a Biome-specific ignore directive.
rspack/worker/chat-worker.js	Removes a Biome-specific ignore directive around switch fallthrough.
rslint.config.ts	Introduces root Rslint configuration and ignore patterns.
rsbuild/vue-vant/components.d.ts	Removes a Biome-specific ignore directive in a generated declaration file.
rsbuild/vue-vant/auto-imports.d.ts	Removes a Biome-specific ignore directive in a generated declaration file.
package.json	Replaces Biome/Husky setup with Prettier, Rslint, lint-staged updates, and simple-git-hooks wiring.
biome.json	Removes the root Biome configuration file.
AGENTS.md	Updates contributor/agent guidance to reflect Prettier + Rslint and adjusts formatting.
.vscode/settings.json	Switches default formatter from Biome to Prettier extension.
.vscode/extensions.json	Updates extension recommendations from Biome to Prettier.
.prettierrc	Adds root Prettier settings matching prior formatting intent.
.prettierignore	Adds ignore rules for common generated/build output.
.husky/pre-commit	Removes Husky pre-commit hook script.

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[Copilot]

The lint script only runs Prettier in check mode against a small, explicit list of root files, so formatting regressions in the actual example sources (e.g. rspack/, rsbuild/, etc.) won’t be caught by pnpm run lint. Consider changing this to a repo-wide Prettier check (e.g. run Prettier against the workspace globs or . with .prettierignore) so the replacement of Biome’s formatter is enforced consistently.

Suggested change

	"lint": "rslint && prettier -c .prettierrc .vscode/extensions.json .vscode/settings.json AGENTS.md package.json pnpm-lock.yaml rslint.config.ts",
	"lint:write": "prettier -w .prettierrc .vscode/extensions.json .vscode/settings.json AGENTS.md package.json pnpm-lock.yaml rslint.config.ts",
	"lint": "rslint && prettier -c .",
	"lint:write": "prettier -w .",

[Copilot]

The PR description says the remaining Biome-specific directives were updated, but there are still // biome-ignore directives present in other tracked files (e.g. rsbuild/vue-auto-import/auto-imports.d.ts, rsbuild/vue-element-plus/auto-imports.d.ts, rsbuild/vue-element-plus/components.d.ts). Either update/remove those directives as well or clarify in the description that only a subset was migrated in this PR.