feat(gui): Add Markdown Support for Descriptions

[colinthebomb1]

Purpose

This PR creates and integrates a new markdown-description component that improves dataset/workflow descriptions to support markdown and gives access to a markdown editor. It is easily extensible to future tabs (ex. ML Models)

Changes

• Created a new markdownDescriptionComponent that Renders markdown descriptions with proper formatting instead of raw text
• Provides an integrated markdown editor using angular-markdown-editor for authorized users
• Shows clean, stripped text in truncated preview and shows fully rendered when clicked.
• Integrated the component into workflow and datasets
• Added proper permission checks so edit functionality only appears for authorized users

Demo:

2025-09-04.16-13-39.mp4

User with edit access:

User without edit access:

Integration into workflow/dataset:

[chenlica]

@bobbai00 Please review this PR. It needs special attention as it's the first major PR of @colinthebomb1. Please do not merge without my approval.

[colinthebomb1]

@bobbai00, Could you review this PR or pass it to someone else to review? Thank you.

[bobbai00]

As @aglinxinyuan is more familiar with this piece of code, can @aglinxinyuan review it?

[aglinxinyuan]

This PR is too large. Please separate this into Two PRs. One for adding markdown editor without any component using it. The other for adding it to workflow and dataset dashboard.