fix(edit-content): relationship field UI improvements

[oidacra]

Summary

• Filters popover width now matches the search input dynamically instead of fixed w-96
• Remove extra padding on filter button addon for cleaner hover state
• Delete button (X) only visible on row hover (new table standard)
• Replace pi-bars drag handle with standard 6-dot grip icon (double pi-ellipsis-v)
• Reduce action column width from w-16 to w-10
• Right-align Status column header and chip to reduce visual gap
• Add contentlet thumbnail preview in the relationship table title column for image content types
• Enable row hover highlighting in the relationship field table
• Unify thumbnail styling in the selection dialog (larger size with rounded corners)
• Add missing JSDoc to #onTouched in language field component

Test plan

• Open relationship field table → drag handle shows 6-dot grip icon, always visible
• Hover over a row → delete (X) button appears; move away → it hides
• Hover over a row → row background highlights
• Relate an image content → thumbnail preview appears next to the title
• Relate a non-image content (e.g. Blog) → only text title shown, no icon/thumbnail
• Open "Add Related Content" dialog → thumbnails show with rounded corners and gray background
• Open "Add Related Content" dialog → click filter button → popover matches search input width
• Filter button hover state covers the full addon area without extra padding
• Status column header and chip are right-aligned

Closes #33066

This PR fixes: #33066

[claude]

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