Chore/lefthook checks

[romradchenko]

Every change is important, so it’s better to verify everything when introducing new updates. Accuracy matters, which is why I also run tests in the examples and make sure everything is consistent for users. It runs very fast, so there’s no need to split this into stages for now.

[Copilot]

Pull request overview

This PR adds lefthook for automated Git hook management, specifically setting up pre-commit checks that run linting, typechecking, and tests before commits. The changes also consolidate and clean up .gitignore patterns across the repository.

• Added lefthook dependency and configured it to run comprehensive checks on pre-commit
• Created npm scripts for build, typecheck, test, and a unified check command
• Centralized .gitignore patterns by moving common patterns to the root and simplifying example-specific ignore files

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
package.json	Added lefthook dependency, created npm scripts for build/test/typecheck workflows, and added prepare script for automatic lefthook installation
package-lock.json	Added lefthook dependency with platform-specific binaries for cross-platform support
lefthook.yml	Created lefthook configuration with pre-commit hook that runs the check command
.gitignore	Added .next-admin directory pattern to centralize ignore rules
examples/next-admin-auth/.gitignore	Simplified by removing patterns now covered by root .gitignore (test-results, playwright-report, .next-admin)
examples/vite-react-auth/.gitignore	Created new file to ignore .auth and .env files specific to this example

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