Task 613: Fix 3D Viewer Label Localization in New Scenes

Status: DONE

Problem

The jupiter-capture (Task 609-610) and earth-arrival (Task 611) 3D scenes have inconsistent label localization:

• Jupiter-capture: shows both Japanese orbit labels ("カリスト", "エウロパ") AND English planet labels ("callisto", "ganymede", "io", "europa") — duplicate labels
• Earth-arrival: shows "luna" (English) alongside "月" (Japanese), "geo"/"leo" in English

Per CLAUDE.md, all reports must be in Japanese. The 3D viewer localization (Task 591) was completed before these scenes were added.

Solution

1. Trace the label generation in orbital-3d-viewer-data.ts for jupiter-capture and earth-arrival scenes
2. Ensure orbit labels use Japanese names and planet labels are either hidden or Japanese
3. Add TDD tests for label content
4. Verify with screenshot capture

Files to Modify

• ts/src/orbital-3d-viewer-data.ts — fix scene label data
• ts/src/orbital-3d-viewer-data.test.ts — add label localization tests
• ts/examples/orbital-3d.html — may need label rendering fixes