✨ Add dev mode theme.json generation

[retlehs]

Summary

• Generate theme.json during vite dev so design token changes are immediately reflected in the WordPress block editor without a full build
• Extract generateThemeJson() from generateBundle() so both build and dev paths share the same token extraction logic
• On server start, call transformRequest() for the CSS entry so Tailwind tokens are available before the first browser request hits WordPress
• Watch baseThemeJsonPath and tailwindConfig for changes, with live-reload of the Tailwind config
• Debounced atomic writes (tmp + rename) to prevent PHP from reading half-written files
• Unescape Vite's JS-wrapped CSS in dev mode so regex patterns can match variable declarations
• Resolve outDir against Vite root so relative paths from laravel-vite-plugin work regardless of cwd

🤖 Generated with Claude Code