Task 562: Add unit tests for episode viewer3d rendering

Status: DONE

Summary

Added 8 unit tests for renderEpisode with viewer3d field, covering container

rendering, section heading, script injection, caption, controls, ordering, TOC, and

omission when viewer3d is absent.

Tests added (8 new)

• templates.test.ts: "renderEpisode with viewer3d" describe block

Files changed

• ts/src/templates.test.ts — 8 new tests (4,033→4,041 TS tests)

Impact

• Stats: 4,041 TS, 282 E2E (4,854 total)