fix: set worker format to es in kilo-ui storybook vite config

[catrielmuller]

Summary

• Fixes Storybook build failure in packages/kilo-ui/ caused by @pierre/diffs worker being loaded via ?worker&url
• Vite defaults worker format to iife, which is incompatible with code-splitting builds, resulting in: "Invalid value 'iife' for option 'worker.format' - UMD and IIFE output formats are not supported for code-splitting builds"
• Adds worker: { format: "es" } to the Vite config in .storybook/main.ts to resolve this

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Project	Deployment	Actions	Updated (UTC)
kilo-ui-storybook	Ready	Preview, Comment	Feb 18, 2026 9:44pm

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

The change adds worker: { format: "es" } to the Vite config in the Storybook viteFinal hook. This correctly configures Vite to emit web workers as ES modules rather than the default IIFE format, which is appropriate for modern browser environments and consistent with the ES module setup already in place.

Files Reviewed (1 files)

• packages/kilo-ui/.storybook/main.ts - 0 issues