fix(DF-773): preserve capitalisation of National Grid, OS, and Or…

[mokhld]

…dnance Survey

Proposed change

What:
Adds lowerFirstPreserveProperNouns to preserve capitalisation of "National Grid", "Ordnance Survey", and "OS" when lowerFirst is applied in validation error messages.

Why:
Error messages were displaying "national Grid" instead of "National Grid" in the server-side rendered error preview panel.

Jira ticket:

Type of change

• Bug fix
• New feature
• Breaking change
• Misc. (documentation, build updates, etc)

Checklist

• You have executed this code locally and it performs as expected.
• You have added tests to verify your code works.
• You have added code comments and JSDoc, where appropriate.
• There is no commented-out code.
• You have added developer docs in README.md and docs/* (where appropriate, e.g. new features).
• The tests are passing (npm run test).
• The linting checks are passing (npm run lint).
• The code has been formatted (npm run format).

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[jbarnsley10]

Looks good