docs: add watch mode tips and best practices section

[Duly330AI]

What

Add a new section with practical tips and best practices for using Jest in watch mode.

Why

Watch mode is a key Jest feature for development, but users often don't know about helpful interactive commands and optimization strategies. This guide improves developer experience.

Changes

• Added 'Watch Mode Tips' section covering:
  • Using with watch
  • Interactive commands (o, f, p)
  • Performance optimization with
  • Using for TDD workflows
  • Cache clearing troubleshooting

Notes

• Docs-only change
• Diff: +13 lines
• Helps Jest developers be more productive

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commit: aa46c76