feat: add Tailwind scoping plugin and integrate into Vite config (#1722)

- Introduced a new PostCSS plugin, `scopeTailwindToUnapi`, to scope
Tailwind CSS classes to specific elements.
- Updated Vite configuration to include the new PostCSS plugin for CSS
processing.
- Enhanced theme management in the theme store to apply scoped classes
and dynamic CSS variables to multiple targets, including the document
root and elements with the `.unapi` class.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Scoped styling for embedded (.unapi) contexts and a PostCSS plugin to
automate it.
* Theme refresh after mount to propagate CSS variables to embedded
roots.
  * Exposed idempotent restart action for the Unraid API when offline.

* **Bug Fixes**
* Consistent dark mode and theme variable application across main and
embedded views.
  * Interactive element and SSO styles now apply in embedded contexts.
* Simplified changelog iframe with a reliable fallback renderer;
improved logs styling scope.

* **Tests**
* New unit tests for the scoping plugin, changelog iframe, and related
components.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

plugin/source/dynamix.unraid.net/usr/local/emhttp/plugins/dynamix.my.servers/include/unraid-api.php

@@ -69,8 +69,45 @@ switch ($command) {
     response_complete(200, array('result' => $output), $output);
     break;
   case 'restart':
+    $lockFilePath = '/var/run/unraid-api-restart.lock';
+    $lockHandle = @fopen($lockFilePath, 'c');
+    if ($lockHandle === false) {
+      response_complete(500, array('error' => 'Unable to open restart lock file'), 'Unable to open restart lock file');
+    }
+
+    // Use a lockfile to avoid concurrently running restart commands
+    $wouldBlock = null;
+    error_clear_last();
+    $acquiredLock = flock($lockHandle, LOCK_EX | LOCK_NB, $wouldBlock);
+    if (!$acquiredLock) {
+      if (!empty($wouldBlock)) {
+        fclose($lockHandle);
+        response_complete(200, array('success' => true, 'result' => 'Unraid API restart already in progress'), 'Restart already in progress');
+      }
+
+      $lastError = error_get_last();
+      $errorMessage = 'Unable to acquire restart lock';
+      if (!empty($lastError['message'])) {
+        $errorMessage .= ': ' . $lastError['message'];
+      }
+
+      fclose($lockHandle);
+      response_complete(500, array('error' => $errorMessage), $errorMessage);
+    }
+
+    $pid = getmypid();
+    if ($pid !== false) {
+      ftruncate($lockHandle, 0);
+      fwrite($lockHandle, (string)$pid);
+      fflush($lockHandle);
+    }
+
     exec('/etc/rc.d/rc.unraid-api restart 2>&1', $output, $retval);
     $output = implode(PHP_EOL, $output);
+
+    flock($lockHandle, LOCK_UN);
+    fclose($lockHandle);
+
     response_complete(200, array('success' => ($retval === 0), 'result' => $output, 'error' => ($retval !== 0 ? $output : null)), $output);
     break;
   case 'status':
@@ -100,4 +137,4 @@ switch ($command) {
     break;
 }
 exit;
-?>
+?>