bug: readonly accordion can be opened using keyboard controls

[averyjohnston]

Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already report this problem, without success.

Ionic Framework Version

v7.x

Current Behavior

If you have an ion-accordion with readonly="true", tab to it, and press Enter, the accordion will open. This does not occur if readonly is set on the parent ion-accordion-group.

Expected Behavior

Readonly accordions should not be interactable, even with keyboard controls.

Steps to Reproduce

1. Navigate to https://ionicframework.com/docs/api/accordion#individual-accordion-1
2. Use the Tab key to focus the second accordion
3. Press Enter; the accordion will open

Code Reproduction URL

https://ionicframework.com/docs/api/accordion#individual-accordion-1

Ionic Info

N/A (reproducible from v7 docs)

Additional Information

ion-accordion-group doesn't exhibit this behavior because of this piece:

ionic-framework/core/src/components/accordion-group/accordion-group.tsx

Lines 208 to 210 in f14a59c

	if (readonly || disabled) {
	return;
	}

Fixing this in ion-accordion should hopefully be as simple as returning early if readonly is set here:

ionic-framework/core/src/components/accordion/accordion.tsx

Line 384 in f14a59c

private toggleExpanded() {

[ionitron-bot]

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