test: cover Navigator technique selection

[scotluns]

Why

Cover the Navigator selection controls through the browser, where search results, matrix cells, and the across-tactics setting must work together.

What Changed

• Add a browser journey that finds and selects a technique through search.
• Check the default selection across two tactic columns, switch to single-tactic selection, and clear the selection.
• Use deterministic synthetic ATT&CK data and check for 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