chore: update md-editor-v3 to v6.0.1

[AlexAndBear]

Description

Related Issue

• Fixes md-editor-v3 Major version bump #1217
• Supersedes fix(deps): update dependency md-editor-v3 to v6 - autoclosed #1207

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)

[Copilot]

Pull Request Overview

Updates the md-editor-v3 dependency from version 5.4.1 to 6.0.1, likely to incorporate bug fixes, new features, or security improvements.

• Dependency version bump for md-editor-v3
• Removal of specific CSS overrides that may no longer be needed
• Clean up of unused styling rules

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/web-pkg/package.json	Updates md-editor-v3 dependency from ^5.4.1 to ^6.0.1
packages/web-pkg/src/components/TextEditor/TextEditor.vue	Removes CSS overrides for .cm-line elements with specific classes

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[JammingBen]

LGTM 👍