Task 620: Fix Inline 3D Viewer Initialization in Episode Pages + E2E Tests

Status: DONE

Problem

1. Inline 3D viewers in episode pages EP01-EP04 never initialized — controls stayed hidden (display:none), no JS errors reported
2. Zero E2E tests for inline 3D viewer initialization in episode pages

Root Cause

In templates.ts, the __prepareScene function is embedded in a template literal string. The regex /^episode-(\d+)$/ used \d which is not a recognized escape sequence in template literals — JavaScript silently converts \d to d, producing the regex /^episode-(d+)$/ which never matches scene names like "episode-1".

EP05 was unaffected because it has a hardcoded if (sceneName === "episode-5") handler that runs before the general episode-N regex handler.

Solution

1. Fixed regex: \d → \\d in template literal (line 3494 of templates.ts)
2. Added 6 E2E tests verifying all 5 episodes initialize without JS errors + EP01 scene name check

Files Modified

• ts/src/templates.ts — Fix escaped regex in __prepareScene template literal
• ts/e2e/reports.spec.ts — Add inline 3D viewer initialization E2E tests