feat: add default_action field to files-actions-menu registration

[jvdp]

fixes #748

[coderabbitai]

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📝 Walkthrough

Walkthrough

This PR adds a defaultAction field to file action menu registration. The OCS V2 controller accepts and validates the parameter ('' → null, or 'default'/'hidden'), the service persists it, the entity exposes and serializes default_action, a migration adds the nullable DB column, and the frontend maps fileAction.default_action to action.default. PHP and JS tests cover valid, empty, and invalid inputs.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat: add default_action field to files-actions-menu registration' clearly and concisely describes the main change in the changeset.
Description check	✅ Passed	The description 'fixes #748' is related to the changeset, linking to the issue requesting default file action registration support.
Linked Issues check	✅ Passed	The PR implements the proposed solution from issue #748 by adding a default_action field to the files-actions-menu registration API with proper validation and persistence across PHP and JavaScript layers.
Out of Scope Changes check	✅ Passed	All changes are directly related to implementing default_action support: controller endpoint updates, database entity and migration, service layer updates, JavaScript frontend changes, and corresponding tests.

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[oleksandr-nc]

@jvdp , could you rebase the PR when you have time?

[jvdp]

@oleksandr-nc rebase done and also fixed up a bit. The second commit is to fix a bug found on CI.