feat: add PreMintButton and ReserveRangeButton components

[Copilot]

Adds new CTA components for pre-minting vouchers and reserving token ranges in price discovery offers.

Changes

• PreMintButton: New component for pre-minting vouchers with loading states and transaction handling
• ReserveRangeButton: Component for reserving token ranges with similar UX patterns
• Price Discovery Support: Updated Price component, ProductCard, and offer detail views to handle price discovery offers (where exchangeToken.decimals === 0)
• SDK Enhancement: Added minted property to range GraphQL queries and subgraph types
• Component Exports: Added new buttons to react-kit index exports

Usage

import { PreMintButton, ReserveRangeButton } from "@bosonprotocol/react-kit";

// Pre-mint vouchers for an offer
<PreMintButton
  offerId="123"
  quantity={5}
  onSuccess={(receipt) => console.log('Minted!', receipt)}
/>

// Reserve a token range
<ReserveRangeButton
  offerId="123"
  length={100}
  onSuccess={(receipt) => console.log('Reserved!', receipt)}
/>

Price discovery offers now display "Price Discovery" instead of attempting to format zero-decimal exchange tokens.

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