feat: export TypeScript types for better DX

[happy-edge]

Summary

Export TypeScript types so integrators get proper autocomplete and type checking.

Before

import { init } from '@jup-ag/plugin';
// ❌ No type exports - integrators have to define their own types or use 'any'

After

import { init } from '@jup-ag/plugin';
import type { IInit, FormProps, QuoteResponse, SwapResult } from '@jup-ag/plugin';

// ✅ Full autocomplete and type checking
const config: IInit = {
  formProps: { /* autocomplete works */ },
  onSuccess: ({ txid, swapResult }) => { /* typed! */ }
};

Exported Types

Main configuration:

• IInit - Main initialization options
• FormProps - Swap form configuration
• JupiterPlugin - Window.Jupiter interface

Display options:

• WidgetPosition - Widget placement options
• WidgetSize - Widget size options
• SwapMode - ExactIn/ExactOut/ExactInOrOut
• DEFAULT_EXPLORER - Explorer options

Callback types:

• IForm - Form state passed to onFormUpdate
• QuoteResponse - Quote data in callbacks
• SwapResult - Result passed to onSuccess
• SwappingStatus - Transaction status
• Screens - Screen state for onScreenUpdate

Impact

Better DX for TypeScript users with zero runtime changes.

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