feat: show visible signature information in signer validation details

[vdriga85]

Closes #8326.

Following the backend changes merged in #8332, this PR adds “Visible signature: Yes/No” to the details of signed signers.

The value comes directly from signer.visibleElements:

• Yes when the array contains at least one element.
• No when the array is empty or absent.

The field is displayed as ordinary metadata, outside the validation-status section. It does not change signature validation or introduce warnings. For envelopes, it uses the signer data for each individual document.

No backend changes or additional matching logic are included.

Testing

• 159 focused tests passed across SignerDetails, DocumentValidationDetails, and SignersList.
• TypeScript checking and focused ESLint passed.
• Production build passed in Linux.
• Manually checked the original signed document: “Visible signature: Yes” is displayed, and the document remains valid.

The tests cover one or multiple visible elements, empty and missing arrays, unsigned signers, collapsed details, and per-document signer data.

The existing Stylelint errors and warnings also occur on the unchanged base revision; this PR does not modify those styles.

[vdriga85]

I've completed the frontend change using signer.visibleElements directly, as you suggested.

The Yes/No field appears in the signed signer's details, outside the validation-status section. No additional matching logic or backend changes were needed.

The focused tests and production build passed. I also checked the original signed document manually: it now shows “Visible signature: Yes”, while the document remains valid.

[codecov-commenter]

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Files with missing lines	Coverage Δ
src/components/validation/SignerDetails.vue	52.08% <100.00%> (+12.20%)	⬆️

... and 220 files with indirect coverage changes

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[vitormattos]

Could you also add a screenshot of the signer details showing the new Visible signature: Yes/No field?

Since this PR changes the validation UI, a screenshot would make the visual result easier to review and would also help document the expected behavior in the PR.

[vdriga85]

Done, fixed.
test_no.pdf
test_no_screen.pdf
test_yes.pdf
test_yes_screen.pdf

[vitormattos]

Thanks! The change looks good now.

Just a small tip for future PRs: when adding screenshots on GitHub, you can attach the image directly to the comment instead of putting the screenshot inside a PDF.

You can copy the screenshot to your clipboard and press Ctrl+V in the GitHub comment field, or drag and drop the image file into the comment. GitHub will upload it and show the image directly in the PR, which makes visual changes much easier to review.

The implementation and tests look good to me. Thanks for the update!