Observable button rendering issue in Quarto #38

Problem

Observable Inputs.button() widgets render incorrectly in Quarto documents:

• Button shows as black box (no visible text)
• Code block displays despite echo: false directive
• Affects tutorials/parquet_cesium.qmd

Attempted Solutions

1. Tried: echo: false directive → Code still shows
2. Tried: echo: fenced → Code still shows
3. Tried: Observable html template (PR Fix button rendering with Observable html template #37) → May be cached/not fully deployed

Current Status

PR #37 merged with html template workaround, but rendering issues may persist due to caching.

Recommendation

Monitor live site after cache clears. If issue persists, may need to:

• Investigate Quarto/Observable version compatibility
• Try alternative UI widgets (toggle, checkbox)
• Revert to automatic classification without button

References

• PR Fix button rendering with Observable html template #37: Fix button rendering with Observable html template
• Live site: https://isamples.org/tutorials/parquet_cesium.html