fix(markups): render wrapped user mentions as plain text

[Shreyas2004wagh]

Fixes #1136

Summary

This PR aligns EmbeddedChat mention rendering with Rocket.Chat core for wrapped mentions.

When the parser emits MENTION_USER tokens for values like (@user), EmbeddedChat currently renders them with mention styling. Rocket.Chat core renders the same pattern as plain text. This change keeps parser behavior unchanged and applies a conservative render-time rule so wrapped mentions are displayed as plain text.

This preserves deterministic behavior and avoids parser-side risk.

Acceptance Criteria fulfillment

• Wrapped user mentions (e.g. (@user)) are rendered as plain text
• Normal mentions (e.g. @user) continue to render as mentions
• Parser behavior is unchanged (render-scoped fix only)

PR Test Details

• yarn workspace @embeddedchat/markups test src/elements/InlineElements.test.js --runInBand
• yarn workspace @embeddedchat/markups build

Notes

I've validated this behavior locally; this PR applies the same render-scoped approach to ensure compatibility with Rocket.Chat core.

[Copilot]

Pull request overview

This PR updates the @embeddedchat/markups rendering layer to match Rocket.Chat core behavior by displaying wrapped user mentions like (@user) as plain text (no mention styling), while keeping normal mentions like @user styled as mentions.

Changes:

• Add a render-time rule in InlineElements to treat MENTION_USER tokens surrounded by ( and ) (with optional whitespace) as plain text.
• Add unit tests covering wrapped vs. normal mention rendering behavior.
• Add Jest/Babel test configuration and a test script for the @embeddedchat/markups workspace package.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/markups/src/elements/InlineElements.js	Detects (@user)-style wrapped mentions and renders them using PlainSpan instead of UserMention.
packages/markups/src/elements/InlineElements.test.js	Adds tests ensuring wrapped mentions render as plain text and unwrapped mentions remain styled.
packages/markups/jest.config.js	Introduces a Jest config for the markups package (Node environment + babel-jest transform).
packages/markups/babel.config.js	Adds a test-only Babel config adjustment for Jest runs.
packages/markups/package.json	Adds a test script to run Jest in the workspace.

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[Copilot]

env.test.presets adds a second @babel/preset-env on top of the top-level presets, so preset-env will run twice with different modules settings. To keep test/build transforms simpler and more predictable, consider conditionally configuring the existing preset-env (e.g., function export + api.env('test')) or using @babel/plugin-transform-modules-commonjs for tests instead of introducing a second preset-env.