feat: add Rosé Pine Dawn theme

[echoriiku]

• Added Rosé Pine Dawn theme JSON
• Added Rosé Pine Dawn CSS for code blocks

[github-actions]

JSON and YAML Validation Results

JSON Validation Results

• ✅ File(s) Passed: 0
• ❌ File(s) Failed: 1
• ⏭️ File(s) Skipped: 0

Violations:

[
  {
    "file": "themes/rose-pine-dawn/v1/theme.json",
    "errors": [
      {
        "path": null,
        "message": "Invalid JSON"
      }
    ]
  }
]

YAML Validation Results

• ✅ File(s) Passed: 0
• ❌ File(s) Failed: 1
• ⏭️ File(s) Skipped: 0

Violations:

[
  {
    "file": "themes/rose-pine-dawn/v1/theme.json",
    "errors": [
      {
        "path": null,
        "message": "Invalid YAML"
      }
    ]
  }
]

[github-actions]

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