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/symfony/clock/CHANGELOG.md

@@ -0,0 +1,25 @@
+CHANGELOG
+=========
+
+7.1
+---
+
+ * Add `DatePoint::getMicrosecond()` and `DatePoint::setMicrosecond()`
+
+6.4
+---
+
+ * Add `DatePoint`: an immutable DateTime implementation with stricter error handling and return types
+ * Throw `DateMalformedStringException`/`DateInvalidTimeZoneException` when appropriate
+ * Add `$modifier` argument to the `now()` helper
+
+6.3
+---
+
+ * Add `ClockAwareTrait` to help write time-sensitive classes
+ * Add `Clock` class and `now()` function
+
+6.2
+---
+
+ * Add the component