feat: add Filepicker Dropzone component with interactive examples

[phev8]

No description provided.

[greptile-apps]

Greptile Summary

Adds a new filepicker dropzone component with comprehensive documentation and refactors interactive examples into modular files.

Key Changes:

• New FilepickerDropzone component with drag-and-drop file upload using react-dropzone
• Introduced Field, FieldLabel, FieldDescription, and FieldError components for form field composition
• Added Separator component using Radix UI
• Refactored all interactive examples from single file into separate modular files with centralized exports
• Comprehensive documentation with React Hook Form integration example

Issues Found:

• Uses experimental React.useEffectEvent API which is not available in React 19.2.4 (requires useCallback instead)

Confidence Score: 2/5

• This PR requires fixing the experimental React API usage before merging
• The component uses React.useEffectEvent which is experimental and not available in the current React version (19.2.4), causing a runtime error. Once replaced with useCallback, the implementation is solid with good accessibility, error handling, and documentation.
• Pay close attention to registry/radix-nova/filepicker-dropzone.tsx - the experimental API must be replaced

Important Files Changed

Filename	Overview
registry/radix-nova/filepicker-dropzone.tsx	New filepicker dropzone component with experimental React API usage (useEffectEvent)
components/docs/interactive-examples/filepicker-dropzone.tsx	Clean interactive example demonstrating the filepicker dropzone component
components/ui/field.tsx	New field wrapper components for form elements with label, description, and error handling
components/ui/separator.tsx	New separator component using Radix UI primitives

_{Last reviewed commit: 9e899d4}

[greptile-apps]

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