fix(retry): make retry delay responsive to abort signal

[itxaiohanglover]

Problem

The withRetry function in src/utils/retry.ts only checked abortSignal at the start of each retry attempt. During the retry delay (up to 30 seconds with default config), the abort signal was completely ignored.

This means if a user calls abort() during a retry delay, the function continues waiting for the full delay before checking the signal on the next iteration. For a 30-second delay, this makes the abort effectively useless.

What changed

Replaced the plain setTimeout delay with an abortable promise that listens for the abort event:

// Before (abort ignored during delay):
await new Promise((resolve) => setTimeout(resolve, delay))

// After (abort fires immediately):
await new Promise((resolve, reject) => {
  const timer = setTimeout(resolve, delay)
  abortSignal?.addEventListener('abort', () => {
    clearTimeout(timer)
    reject(new Error('Aborted'))
  }, { once: true })
})

Validation

• tsc — compiles without errors (no type changes)
• No behavior change when no abortSignal is provided
• When abortSignal is provided and fires during delay, the promise rejects immediately with Error('Aborted') instead of waiting