fix: auto right-align numeric columns and normalize decimal formatting in tables

[kirangadhave]

📝 Summary

Numeric columns are properly aligned

Closes #8871

🔍 Description of Changes

Improves readability of numeric columns in mo.ui.table by auto-aligning and normalizing number formatting.

• numeric columns are automatically right-aligned by default.
• number of digits after decimals are normalized so everything is aligned and scannable
• numeric cells use font-variant-numeric: tabular-nums for uniform char width (no col jiggle)

Also fixed boolean column rendering to be more pythonic: True/False instead of true/false

Before:

After:

Added tests for auto-alignment, fraction digits, boolean rendering

📋 Checklist

• I have read the contributor guidelines.
• Tests have been added for the changes made.
• Pull request title is a good summary of the changes - it will be used in the release notes.

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Project	Deployment	Actions	Updated (UTC)
marimo-docs	Ready	Preview, Comment	Mar 26, 2026 9:42pm

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[kirangadhave]

I have read the CLA Document and I hereby sign the CLA

[mscolnick]

awesome, much better on the eyes!

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.21.2-dev64