Fix agent overlay row alignment

[highbyte]

Summary

• preserve native table-cell layout in the Agents overlay
• move grid and flex positioning into inner content wrappers
• add regression coverage for the rendered markup and CSS layout contract

Verification

• dotnet test Wrighty.slnx --configuration Release — 2,285 passed, 0 warnings
• npm test — 93 passed with coverage thresholds
• package-manager manifest tests — 6 passed
• release smoke tests — 2 passed
• live Browser verification — all cells in each agent row share identical geometry and render as table cells

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud