Feature Request: Developer-Centric Enhancements (Sensitive Data Masking)

For all's convenience, please use English to fill this issue.

Is your feature request related to a problem? Please describe.

As a developer, I frequently use QuickLook to glance at configuration files. I currently face two main points of friction:

Visualizing Styles: It is difficult to verify colors in CSS or Tailwind configs without opening a full IDE, as hex codes and RGBA strings aren't intuitive at a glance.

Security Risks: Previewing .env files during screen shares or presentations is dangerous, as sensitive API keys and secrets are immediately exposed in plain text.

Describe the solution you'd like

I would like to propose a "Developer Power-User" update to the text previewer that includes:

1. Live Color Swatches: Automatically detect color strings (Hex, RGB, RGBA, HSL) in CSS, SCSS, and Tailwind config files and render a small color preview box next to the code.

2. Environment Variable Masking: For .env files, implement a "Privacy Mode" that masks values (e.g., DATABASE_URL=********). A "Show/Hide" toggle (eye icon) could be added to the toolbar to reveal the secrets when needed.

Describe alternatives you've considered

For Colors: Relying on memory or opening VS Code just to check a shade.

For Masking: Avoiding .env files entirely during calls or manually blurring screen recordings.