fix: persist focus on consent

[rmch91]

Closes: https://jira.tools.sap/browse/CXSPA-11392

QA steps:
Checkbox focus retained on toggle

1. Open the storefront as an anonymous (not logged in) user
2. Click the "Consent management" link in the footer to open the Anonymous Consent Dialog
3. Tab to a consent checkbox
4. Press Space to toggle the checkbox

Expected: Focus remains on the same checkbox. A success message appears but does not steal focus.
Press Space again to un-toggle
Expected: Focus still remains on the same checkbox.

Message close restores focus

1. Open the Anonymous Consent Dialog
2. Toggle a checkbox (success message appears)
3. Tab to the message close button and press Space
   Expected: Focus returns to the previously toggled checkbox

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[cypress]

spartacus    Run #52552

Run Properties:   Passed #52552  •  592fddb15d ℹ️: Merge be0716151e922ae21a664a4840c7821d4ebdb0c4 into 65b052be3484c32b1ff50a9284aa...

Project	spartacus
Branch Review	CXSPA-11392
Run status	Passed #52552
Run duration	04m 12s
Commit	592fddb15d ℹ️: Merge be0716151e922ae21a664a4840c7821d4ebdb0c4 into 65b052be3484c32b1ff50a9284aa...
Committer	Roman
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Test results
Failures	0
Flaky	3
Pending	0
Skipped	0
Passing	101
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[Pio-Bar]

Changes look good to me. I've tested the ConsentDialogComponent and the focus stays on checkboxes after toggling. It is not lost after the success message is closed. The Screen reader output seems consistent as well.

However, I see the original ticket concerned the ConsentManagementComponent not the dialog. When testing on /my-account/consents the focus is lost after toggling the checkboxes. The component re-renders causing the focus to default to the body element. Is this in the scope of the ticket?