feat: add Win-style prompts for download and clear actions

[kaic]

Description

Replaces the native browser confirm() with a Windows-style dialog and adds a Windows-style pre-download prompt. The download message was removed from the header and is now shown only when the user clicks “Download Script”, with explicit Download/Close actions. The “Clear All” flow now uses a Clear/Cancel dialog.

Type of Change

• feat: New feature (software, configuration, or functionality)
• fix: Bug fix
• docs: Documentation update
• refactor: Code refactoring (no functional changes)
• chore: Maintenance (dependencies, configs, etc.)
• test: Adding or updating tests

Related Issue

Closes #

Changes Made

Screenshots

Checklist

• I have tested my changes locally
• My code follows the project's code style
• I have used conventional commit format for my commit messages
• My changes do not break the build (npm run build)
• My changes pass linting (npm run lint)
• I have updated documentation if necessary

For Catalog Changes (Software/Configurations)

• I have verified the winget ID is correct (for software)
• I have tested the configuration on Windows 10/11 (for configs)
• I have added appropriate icons
• I have placed the item in the correct category

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