fix(files_sharing): prevent double-escaping of display names in sharing UI

[predictor2718]

• Resolves: [Bug]: Avatar hover description in Files shows "&" instead of "&" #51448

Summary

• Display names containing & were shown as & in sharing tooltips and labels because t() escapes HTML by default and Vue escapes again on render
• Added { escape: false } to t() calls in sharingStatusAction.ts, SharingEntry.vue, and SharingEntryInherited.vue, following the existing pattern in SharingEntryLink.vue and SharedWithMe.js
• Added unit tests for sharingStatusAction title function to prevent regression

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI