Guard missing contact-card clipboard helper

[VatsalSy]

Summary

• Prevent the contact card from throwing before its existing copy-error handling when the shared clipboard helper is unavailable
• Address the concrete post-merge review finding on PR Add in-house contact card #101

Changes

• Add optional chaining to the copyToClipboard method call in assets/js/contact-card.js
• Keep the existing fallback status message and control flow unchanged

Testing

• npm test -- --runInBand contact-card.test.js (6 tests passed)
• ./scripts/lint-check.sh (passed)
• git diff --check (passed)

Evidence

• Add in-house contact card #101 (comment)

[Copilot]

Pull request overview

This PR hardens the /contact-card/ clipboard path by ensuring the page doesn’t throw a TypeError when window.Utils exists but its copyToClipboard helper is missing, allowing the existing “copy failed” status handling to run as intended.

Changes:

• Guard the copyToClipboard invocation with optional-call chaining (?.(...)) so a missing helper yields a controlled failure (copied falsy) instead of an exception.
• Preserve existing fallback status messages and control flow for both “Copy email” and “Share card” actions.

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