feat: add abort/cancel support for confirmations

[haradakunihiko]

Summary

Adds support for externally cancelling confirmation dialogs.

• Support for standard AbortController/AbortSignal pattern
• abort(promise) to cancel individual promises
• abortAll() to cancel all pending promises
• Fully backward compatible

Key Changes

New Files

• src/controls.ts: Abort functionality implementation
  • Custom AbortError class
  • Registry pattern to manage promises
  • abort(), abortAll(), attachAbortSignal() functions
• __tests__/abort.test.ts: 7 test cases

Modified Files

• src/types.ts: Added ConfirmationOptions type
• src/createConfirmation.ts: Promise registry registration and AbortSignal support
• src/index.ts: Export abort/abortAll
• README.md: Added usage examples and error handling documentation

Usage

Via AbortController (Recommended)

import { confirm } from './confirm';

const handleOperation = async (): Promise<void> => {
  const abortController = new AbortController();
  
  const resultPromise = confirm(
    { message: 'Continue?' },
    { signal: abortController.signal }
  );
  
  // Can abort later
  abortController.abort();
  
  try {
    const result = await resultPromise;
  } catch (error) {
    if (error instanceof Error && error.name === 'AbortError') {
      console.log('Dialog was aborted');
    }
  }
};

Via Utility Functions

import { confirm, abort, abortAll } from 'react-confirm';

const p1 = confirm({ message: 'Delete item 1?' });
const p2 = confirm({ message: 'Delete item 2?' });

abort(p1);    // Cancel individual
abortAll();   // Cancel all

Testing

• New tests: 7 (all passing)
• Existing tests: 69 (all passing)
• Total: 76 tests passing

Run tests:

npm test
npm run typecheck
npm run build

Compatibility

• No breaking changes to existing API
• Second argument to createConfirmation is optional
• Aborted promises reject with AbortError (name === 'AbortError')

Improvements over PR #127

1. Parameter name changed from control to options (more conventional)
2. Custom AbortError class for better type safety
3. More comprehensive test coverage (7 test cases)
4. Error handling examples added to README
5. All code comments in English

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