Fix resize() method to actually invoke trigger

[Copilot]

The resize() method was creating a bound function but never calling it, making iframe.iframeResizer.resize() a no-op.

Changes

• packages/core/methods/attach.js: Changed trigger.bind(null, 'Window resize', RESIZE, id) to trigger('Window resize', RESIZE, id) to actually dispatch the resize message

The fix aligns with the pattern used by other methods in the same file (moveToAnchor, sendMessage) which call trigger() directly.

// Before (no-op)
resize() {
  advise(id, DEPRECATED_RESIZE)
  trigger.bind(null, 'Window resize', RESIZE, id)  // Creates function, never calls it
}

// After (working)
resize() {
  advise(id, DEPRECATED_RESIZE)
  trigger('Window resize', RESIZE, id)  // Actually sends the message
}

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