chore(deps): Remove unused luxon dependency

[rusackas]

User description

Summary

This PR removes the luxon date/time library which is not used anywhere in the Superset frontend codebase.

Analysis

Using dependency analysis tooling, I verified that:

• Zero imports: No imports of luxon found in any source files (src/, packages/, plugins/)
• No transitive dependencies: Not required by any other packages
• No build/config usage: Not referenced in webpack, babel, or other configuration files
• Not in scripts: Not used in any npm scripts

Changes

• Removed luxon (^3.7.1) from package.json dependencies
• Updated package-lock.json accordingly

Impact

• Bundle size reduction: Luxon is approximately 73KB minified
• Reduced maintenance: One less dependency to track and update
• No functionality changes: The library was completely unused

Testing

• Verified no imports exist: rg "from ['\"]luxon|import.*luxon|require.*luxon"
• Frontend builds successfully
• No TypeScript or linting errors

Context

Luxon appears to have been added but never used, possibly considered as an alternative to existing date libraries (dayjs, moment) but not adopted. The codebase primarily uses dayjs for date/time operations.

🤖 Generated with Claude Code

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CodeAnt-AI Description

Remove unused luxon dependency from frontend

What Changed

• Removed the luxon dependency from superset-frontend package.json and package-lock.json so it is no longer installed with the frontend
• There are no imports of luxon and no user-visible functionality changes after this removal
• Reduces the frontend dependency surface and bundle contents

Impact

✅ Lower frontend bundle size (~73KB removed) ✅ Fewer dependencies to track and update ✅ Shorter install time for frontend developers

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