test: cover Navigator layer comparison

[scotluns]

Why

Extend the new Playwright foundation with Navigator's demonstrated threat-intelligence workflow: compare two groups by combining scored layers and identify their shared techniques.

What Changed

• Add a browser journey that creates APT3 and APT29 layers, selects each group's techniques, scores them 1 and 2, and combines the layers with a+b.
• Use a small synthetic overlap so the resulting scores 1, 2, and 3 are predictable without relying on changing ATT&CK group mappings.
• Check the resulting layer name, technique scores, high-end gradient color, and browser errors.

How To Verify

From the repository root:

docker build -f nav-app/e2e/Dockerfile -t attack-navigator-e2e:local .
docker run --rm --init attack-navigator-e2e:local

The production build and full E2E suite passed locally in Docker (2/2 tests).

[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