fix: use partial match for post visibility option selectors (#591)

[sigvardt]

Summary

Resolves #591.

LinkedIn recently updated their "Anyone" post visibility option label to include additional descriptive text (e.g., "Anyone on or off LinkedIn") inside the radio button / label element. The previous { exact: true } exact-match regex caused automation to fail to find this option.

Changes

• Removed { exact: true } from buildLinkedInSelectorPhraseRegex and formatLinkedInSelectorRegexHint in createVisibilityOptionCandidates.
• The automation will now match any visibility option containing the "Anyone" text (or localized equivalents) instead of requiring an exact, character-perfect match.

Closes #591