refactor: Cleanup git state - commit all staged changes

Major refactoring cleanup:
- Add new controller architecture (class-controller-*.php)
- Add new settings-v2 UI (views/settings-v2/)
- Add new CSS architecture (agentic-sidebar.css, tokens)
- Add esbuild build pipeline (scripts/build.js, package.json)
- Add composer dependencies (vendor/)
- Add frontend src directory (assets/js/src/index.jsx)
- Add documentation files
- Remove old/obsolete files (class-settings.php, old CSS)

This commits all pending changes from previous refactoring efforts.

vendor/phpdocumentor/flyfinder/README.md

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+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+[![Coveralls Coverage](https://img.shields.io/coveralls/github/phpDocumentor/FlyFinder.svg)](https://coveralls.io/github/phpDocumentor/FlyFinder?branch=master)
+[![Scrutinizer Code Coverage](https://img.shields.io/scrutinizer/coverage/g/phpDocumentor/FlyFinder.svg)](https://scrutinizer-ci.com/g/phpDocumentor/FlyFinder/?branch=master)
+[![Scrutinizer Code Quality](https://img.shields.io/scrutinizer/g/phpDocumentor/FlyFinder.svg)](https://scrutinizer-ci.com/g/phpDocumentor/FlyFinder/?branch=master)
+[![Stable Version](https://img.shields.io/packagist/v/phpDocumentor/FlyFinder.svg)](https://packagist.org/packages/phpDocumentor/FlyFinder)
+[![Unstable Version](https://img.shields.io/packagist/vpre/phpDocumentor/FlyFinder.svg)](https://packagist.org/packages/phpDocumentor/FlyFinder)
+
+
+FlyFinder
+=========
+
+FlyFinder is a plugin for [Flysystem](http://flysystem.thephpleague.com/) that will enable you to find files
+based on certain criteria.
+
+FlyFinder can search for files that are hidden (either because they are hidden files themselves, or because they are
+inside a hidden directory), that have a certain extension, or that exist in a certain path.
+
+Flyfinder does *not* return directories themselves... only files.
+
+## Installation
+
+The easiest way to install this library is with [Composer](https://getcomposer.org) using the following command:
+
+    $ composer require phpdocumentor/flyfinder
+
+## Examples
+
+Ready to dive in and don't want to read through all that text below? Just consult the [examples](examples) folder and
+check which type of action that your want to accomplish.
+
+## Usage
+
+In order to use the FlyFinder plugin you first need a Flyfinder filesystem with an adapter,
+for instance the local adapter.
+
+    use League\Flysystem\Filesystem;
+    use League\Flysystem\Adapter;
+    use Flyfinder\Finder;
+
+    $filesystem = new Filesystem(new Adapter\Local(__DIR__.'/path/to/files/'));
+
+Now you can add the plugin as follows:
+
+    $filesystem->addPlugin(new Finder());
+
+FlyFinder will need specifications to know what to look for. The following specifications are available:
+
+- IsHidden (this specification will return `true` when a file or directory is hidden,
+- HasExtension (this specification will return `true` when a file or directory has the specified extension),
+- InPath (this specification will return `true` when a file is in the given path. Wildcards are allowed.)
+  - note that this path should be considered relative to the `$filesystem`'s path
+
+Specifications can be instantiated as follows:
+
+    use Flyfinder\Path;
+    use Flyfinder\Specification\IsHidden;
+    use Flyfinder\Specification\HasExtension;
+    use Flyfinder\Specification\InPath;
+
+    $isHidden = new IsHidden();
+    $hasExtension = new HasExtension(['txt']);
+    $inPath = new InPath(new Path('mydir'));
+
+### Combining specifications
+
+You can search on more criteria by combining the specifications. Specifications can be chained as follows:
+
+`$isHidden->andSpecification($hasExtension)` will find all files and directories that are hidden AND have the given
+extension.
+
+`$isHidden->orSpecification($hasExtension)` will find all files and directories that are hidden OR have the given
+extension.
+
+`$isHidden->notSpecification` will find all files and directories that are NOT hidden.
+
+You can also make longer chains like this:
+
+` $specification = $inPath->andSpecification($hasExtension)->andSpecification($isHidden->notSpecification());`
+
+This will find all files in the given path, that have the given extension and are not hidden.