Task 565: Add unit tests for summary template viewer3d rendering

Status: DONE

Summary

Added 4 unit tests for renderSummaryPage with viewer3d sections: container

rendering, Three.js script injection, omission when absent, and controls.

Tests added (4 new)

• templates.test.ts: viewer3d container, importmap, no-viewer3d omission, controls

Files changed

• ts/src/templates.test.ts — 4 new tests (4,041→4,045 TS tests)

Impact

• Stats: 4,045 TS, 284 E2E (4,860 total)