[Feature] [Studio] Enhance settings experience and add markdown import support

[Gautam25Raj]

Summary

This PR improves the resume editor customization experience with enhanced settings controls, introduces markdown resume import functionality, and expands cover letter visibility management for more flexible document rendering.

Features

Resume Import

• Added resume-markdown-import service for importing resumes from Markdown files
• Integrated Markdown import workflows into the resume service
• Improved resume onboarding and migration experience

Editor Settings Enhancements

• Updated SettingControls with improved layout and hint presentation
• Refactored SettingsSelect to use a custom select component with dropdown indicators
• Enhanced SettingsRange with:
  • Visual progress representation
  • Current value display
• Improved SettingsColor with:
  • Selected color preview
  • Hex value display

Cover Letter Visibility Controls

• Added isCoverLetterSectionVisible utility
• Implemented section visibility controls for cover letter templates
• Improved rendering flexibility for customizable cover letter layouts

Improvements

User Experience

• Enhanced settings usability and visual feedback
• Improved customization workflows across editor settings
• Streamlined resume import experience

Rendering & Maintainability

• Improved cover letter rendering consistency
• Simplified section visibility handling
• Enhanced maintainability of editor configuration systems

Notes

• No breaking changes
• Focused on editor customization, resume import workflows, and document rendering flexibility

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🧪 Tests (adding or updating tests)

Checklist

• I have read the CONTRIBUTING.md document.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• Any dependent changes have been merged and published in downstream modules.