feat(string-helpers): Handle string literal type in capitalize

[tassoevan]

Proposed changes (including videos or screenshots)

It ensures the return type of capitalize is a capitalization of the input e.g. capitalize('example' as const) returns the string literal type Capitalize<'example'>, equivalent to 'Example'.

Issue(s)

Further comments

It leverages the utility type Capitalize<T> to avoid widening the type of the input.

[changeset-bot]

🦋 Changeset detected

Latest commit: 01890c2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@rocket.chat/string-helpers	Minor

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[Copilot]

Pull Request Overview

This PR enhances the capitalize function in the string-helpers package to preserve TypeScript string literal types. Instead of returning a generic string type, the function now returns Capitalize<T> where T is the input string literal type.

• Updated function signature to use generics with Capitalize<T> utility type
• Added type assertions to maintain type safety while preserving literal types
• Added changeset documentation for the feature enhancement

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/string-helpers/src/capitalize.ts	Enhanced function signature and return type to preserve string literal types using TypeScript generics
.changeset/ripe-numbers-deny.md	Added changeset entry documenting the new feature