Task 295: Accessibility Improvements

Status: DONE

Goal

Fix ARIA accessibility issues in HTML generation templates for better screen reader support.

Issues to Fix

1. Task progress bar SVG missing role="img" and aria-label (templates.ts ~3356)
2. Nav dropdown buttons missing aria-expanded and aria-haspopup (templates.ts ~787-801)
3. Play button aria-label doesn't toggle between 再生/一時停止 (templates.ts ~1855)
4. Transcription tab buttons lack ARIA tab pattern (templates.ts ~3195)
5. SQL query textarea missing aria-label (templates.ts ~3500)
6. Brachistochrone preset buttons lack aria-pressed (templates.ts ~2188)
7. Mark orbital_transfer_diagrams.md idea as RESOLVED

Files to Update

• ts/src/templates.ts
• ideas/orbital_transfer_diagrams.md