[WIP] Implement !important for @apply

[Copilot]

• Explore repository structure and understand codebase
• Run existing tests to verify current functionality
• Analyze current @apply implementation in both Tailwind 3 and 4
• Understand CSS Tree tokenization and !important handling
• Create tests for @apply with !important syntax
• Update syntax definitions for both Tailwind 3 and 4 to allow !important
• Update tailwind-apply.js parser to consume !important tokens
• Fix parsing to set important property on Atrule node
• Ensure all tests pass
• Verify functionality manually

Progress made:

• Added comprehensive tests for !important support in both Tailwind 3 and 4
• Fixed syntax definitions to use correct format: [ '!' important ]?
• Updated prelude parser to consume !important tokens
• Parsing no longer falls back to Raw type - proper AtrulePrelude is generated
• Validation tests now pass, showing syntax definitions work correctly

Current issue: Need to set important: true property on Atrule node when !important is present. The prelude parser consumes the tokens correctly but cannot modify the parent atrule node.

Fixes #3.

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