fix(core): should be able to unresolve a resolved comment (#13078)

#### PR Dependency Tree


* **PR #13078** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* The resolve comment button is now always visible to users with
permission to resolve comments, regardless of the comment's current
status.

* **Refactor**
* Adjusted internal comment resolution logic to streamline how missing
comments are handled between the provider and the editor.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/components/comment/sidebar/index.tsx

@@ -362,7 +362,7 @@ const CommentItem = ({
         data-menu-open={menuOpen}
         data-editing={isEditing}
       >
-        {!comment.resolved && canResolveComment && (
+        {canResolveComment && (
           <IconButton
             variant="solid"
             onClick={handleResolve}