Fix identity display name in merge dialog

[joanagmaia]

Changes proposed ✍️

What

🤖[deprecated] Generated by Copilot at 0064247

Fix display of organization names in merge suggestions. Use identity.name as a fallback when identity.displayName is missing in organization-merge-suggestions-details.vue.
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🤖[deprecated] Generated by Copilot at 0064247

identity.name
fallback for empty display
autumn leaves merge

Why

How

🤖[deprecated] Generated by Copilot at 0064247

• Add fallback value for identity name in organization merge suggestions details component (link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screenshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.