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/league/csv/phpstan-build.neon

@@ -0,0 +1,22 @@
+includes:
+    - vendor/phpstan/phpstan-deprecation-rules/rules.neon
+    - vendor/phpstan/phpstan-strict-rules/rules.neon
+    - vendor/phpstan/phpstan-phpunit/extension.neon
+    - vendor/phpstan/phpstan-phpunit/rules.neon
+parameters:
+    ignoreErrors:
+        - identifier: missingType.generics
+        - identifier: missingType.iterableValue
+        - '#implements deprecated interface League\\Csv\\ByteSequence#'
+        - '#Dom\\HTMLElement#'
+        - '#Dom\\XMLDocument#'
+        - '#Dom\\HTMLDocument#'
+        - '#Dom\\Element#'
+    level: max
+    paths:
+        - src
+    reportUnmatchedIgnoredErrors: true
+    treatPhpDocTypesAsCertain: false
+    parallel:
+        processTimeout: 300.0
+