PADV-1593: Expand Annotation Textbox

[Serafin-dev]

Related tickets

https://github.com/Pearson-Advance/pearson-core/tree/vue/PADV-1593

Description:

This PR is part of the AI assistance project and aims to add style and responsiveness to the the annotation textbox in order to improve the UX of users who read the summarized text .

How to test:

• Setup devstack and pull changes.
• Setup edx notes api service.
• Setup Pearson core plugin
• Follow instructions to enable LLM summarize endpoint in pearson core.
• Enable the waffle switch 'pearson_core.llm_summarize.enable_llm_summarize'
• On studio, select a course, go to advance settings, and on the 'other course settings field' put the following JSON:

{
  "llm_summarize": {
    "is_enabled": true,
    "summarization_prompt": "Some base prompt here"
  }
}

• Select a text inside a text or HTML block.
• Click on the summarize button.

Reviewers:

• @alexjmpb