fix: Use Dialog instead of deprectaed ResponsiveModel

[jpye-finch]

Description

• Assign dialog now uses Dialog and corrects the order of the buttons
• Unassign dialog now uses Dialog
• Event History dialog now uses Dialog

Checklist

• I have linked the correct Github issue under "Development"
• I have tested the changes locally, and written appropriate tests
• I have tested beyond the happy path (e.g. edge cases, failure paths)
• I have updated the changelog with this change (if applicable)
• I have updated the GitHub issue status accordingly

[github-actions]

Oops! Looks like you forgot to update the changelog. When updating CHANGELOG.md, please consider the following:

• Changelog is read by country implementors who might not always be familiar with all technical details of OpenCRVS. Keep language high-level, user friendly and avoid technical references to internals.
• Answer "What's new?", "Why was the change made?" and "Why should I care?" for each change.
• If it's a breaking change, include a migration guide answering "What do I need to do to upgrade?".

[github-actions]

ℹ️ Coverage metrics explained:
• Statements — Executed code statements (basic logic lines)
• Branches — Tested decision paths (if/else, switch, ternaries)
• Functions — Functions invoked during tests
• Lines — Source lines executed

[github-actions]

📊 commons test coverage

Statements: 67.08%
Branches:   32.76%
Functions:  50%
Lines:      66.48%
Updated at: Thu, 12 Feb 2026 10:12:00 GMT

[github-actions]

📊 events test coverage

Statements: 86.25%
Branches:   84.29%
Functions:  92.66%
Lines:      86.25%
Updated at: Thu, 12 Feb 2026 10:16:44 GMT

[github-actions]

This PR has been marked with label stale Since it has been inactive for 20 days. It will automatically be closed in 10 days if no further activity occurs.

[github-actions]

This PR has been automatically closed because it has been inactive for 30 days. Please reopen if you are still working on it.