Fiddle: corrections for new styling + fix storybook

[krishan711]

Description

Screenshots:

Checklist:

• I have updated the CHANGELOG with a summary of my changes
• I have updated the documentation accordingly

[Copilot]

Pull request overview

This PR enhances the toast component styling and fixes Storybook configuration issues. It adds comprehensive theme support with CSS custom properties for toast variants (success, error, warning, info) and updates the Storybook setup to properly display toasts in the development environment.

• Adds complete toast theming with CSS custom properties for colors, padding, borders, and shadows with sensible default values
• Fixes Storybook by consolidating UI library imports and adding ToastContainer decorator for proper toast rendering
• Updates @kibalabs/build dependency and corrects peerDependencies version requirement

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
src/styles.scss	Adds toast container max-width override, white-space property, and comprehensive theme layer with CSS custom properties for toast variants
package.json	Updates @kibalabs/build to 0.13.3-next.13
package-lock.json	Updates @kibalabs/build version and corrects @kibalabs/ui-react peerDependency from >=0.13.3-next.12 to >=0.11.3-next.18
.storybook/preview.tsx	Consolidates @kibalabs/ui-react imports to single dist/index.css file and adds ToastContainer decorator for proper toast rendering in stories

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