fix default argument in decentralized event handler example

[adhami3310]

also add tailwind to config

[greptile-apps]

PR Summary

Updates to documentation and configuration to align with best practices and future compatibility requirements.

• Modified example in docs/events/decentralized_event_handlers.md to remove mutable default argument amount: int = 1, improving code safety and clarity
• Updated rxconfig.py to explicitly declare TailwindV3Plugin, preparing for deprecation of automatic Tailwind configuration
• Example code now requires explicit amount values in button on_click handlers, better matching real-world usage patterns

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