feat: add @match directive support

[bezustally]

Overview

Adds support for @match directive in usercss files.

Closes #2002

What's Added

• @match directive support for URL pattern matching
• Enhanced meta parser to handle @match directives
• Updated style matcher and usercss compiler for @match compatibility
• UI improvements to display @match patterns in style management and installation

Usage

@match https://example.com/*
@match https://*.github.com/*

body {
  background: red;
}

Styles with @match directives will now only apply to the specified domains.

UI Changes

• Enhanced installation UI with favicon display for @match domains
• Added display of @match patterns in the style management interface

Files Changed

• src/js/meta-parser.js - Added @match parser
• src/background/style-manager/matcher.js - Enhanced matching
• src/background/usercss-manager.js - Updated usercss handling
• src/js/usercss-compiler.js - Added @match compilation
• src/js/sections-util.js - Better sections processing
• src/js/prefs.js - Enhanced preferences
• src/install-usercss/index.js - Added @match support and favicon display
• src/manage/ files - UI updates and @match display