fix: allow null $context in dashboardOptions capability filter

[YvetteNikolov]

$context kan opeens null zijn? Na een update van SEOPress. Kan verder geen referentie vinden van deze hook in een changelog.

Fix deze error als je in het menu komt

[Copilot]

Pull request overview

This PR fixes a runtime type error in the SEOPress capability filter callback by allowing the $context argument to be null, which can occur when SEOPress invokes the seopress_capability filter without (or with a null) context.

Changes:

• Update dashboardOptions() signature to accept an optional nullable $context (?string $context = null).
• Switch capability-context comparisons to strict equality (===) to align with strict typing.

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