feat: enhance QR code generation and input handling

[nielthiart]

• Updated QRCodeController to use a textarea for input instead of an input field for better user experience.
• Implemented debouncing for input changes to optimize QR code generation.
• Removed unnecessary SVG sanitization functions and adjusted SVG handling in QR code rendering.
• Added default debounce delay option in QRCodeController.
• Improved error handling in the application initialization process with a more structured error message display.
• Removed inline css again.
• Updated Vite configuration to include plugins for single file output and minification, along with CSP policies for security.

[Copilot]

Pull Request Overview

This PR enhances QR code generation and input handling, optimizes asset delivery through Vite configuration updates, and improves application error handling and styling.

• Replaces an input field with a textarea and adds input debouncing in QRCodeController.
• Removes SVG sanitizing functions and adjusts QR code rendering logic.
• Updates Vite configuration and package scripts to support single file output, minification, and CSP policies.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
vite.config.ts	Added plugins for single file output and minification; updated CSP policy with style-src.
src/utils/svg-sanitizer.ts	Removed unused SVG sanitization functions.
src/style.css	Added global styles including layout and responsive styles.
src/main.ts	Improved error message rendering using DOM APIs.
src/core/qr-generator.ts	Updated QR generation options by disabling XML declaration.
src/controllers/qr-code-controller.ts	Changed input handling to use a textarea with debouncing; removed SVG sanitization.
package.json	Updated linting and dependency configuration.
index.html	Removed inline CSS and switched input field to textarea; adjusted script loading.
.stylelintrc.json	Added configuration for stylelint.