Update story.ts: improve Conditional typing

[iFonny]

What I did

Small PR to Improve typing of Conditional ('if.arg') to make it typesafe with TArgs

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

Greptile Summary

Improves TypeScript type safety for Storybook's Conditional feature by making relevant types generic with TArgs, ensuring stricter type checking for conditional arguments in stories.

• Makes ConditionalValue and Conditional types generic with TArgs to enforce type safety
• Updates InputType interface to be generic and propagate TArgs type parameter
• Ensures 'arg' property in conditional statements must be a valid key of component args
• Enhances type checking without runtime impact

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[greptile-apps]

LGTM

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[greptile-apps]

LGTM

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