Allow filtering of permitted formats

[g30r93g]

Summary

Adds an allowedFormats prop to control which color formats are available and hides the format selector if there’s only one option. Keeps sensible defaults and remains backward compatible.

Key Changes

• allowedFormats prop: Adds optional allowedFormats?: Array<'HEX' | 'RGB' | 'HSL'> with default ['HEX','RGB','HSL'] to keep current behavior unchanged.
• Conditional format selector: Renders the <Select> only when there’s more than one allowed format, and filters options by allowedFormats.
• Minor tidy-up: Import ordering and small whitespace normalization in inline styles.

API

New prop: allowedFormats?: Array<'HEX' | 'RGB' | 'HSL'> (default: ['HEX','RGB','HSL']). Backward compatible.
Behavior: Selector hides when only one format is permitted.

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