TODO: Handle Error for Existing Branch on Word Submission

When a user submits a new word or edits an existing word in the dictionary, the system should check if the branch already exists before attempting to create a new branch. Currently, if a branch with the same name already exists, the submission process fails without providing a clear error message to the user.

https://github.com/babblebey/jargons.dev/blob/0eeb366b4346c28a400586082fadb331c0ee342f/src/lib/branch.js#L10

Proposed Solution:

1. Add a check in the submission process to verify if the branch already exists. (but this will assume that a fork has already been created before-hand)
2. If the branch exists, display a user-friendly error message indicating that the word already exists in the dictionary.
3. Provide guidance on how to proceed, such as editing the existing word instead of creating a new one.

Additional Notes:

• Important to state that the proposed solution is pretty much me thinking out loud, I have some thought which really looks like it will change how/when we fork in order to address this in the way I am thinking about
• Its also important to know how/when we fork too, I can shed more lights on this

Empieza en src/lib/branch.js, alrededor de la línea 10, y sigue el flujo de envío de palabras, incluido cuándo se crean el fork y la branch. Determina cómo se detecta una branch existente y cómo el envío informa actualmente del fallo. Se considera terminado cuando los envíos duplicados reciben un mensaje claro que indica a los usuarios que editen la palabra existente, con el momento de creación del fork comprendido.