fix: resolve RedisCache array offset error and improve discovery diagnostics

- Fix RedisCache driver to handle MGET failures gracefully with fallback
- Add comprehensive discovery context comparison debug tools
- Identify root cause: WEB context discovery missing 166 items vs CLI
- WEB context missing RequestFactory class entirely (52 vs 69 commands)
- Improved exception handling with detailed binding diagnostics

src/Framework/Design/ComponentScanner.php

@@ -16,6 +16,9 @@ use App\Framework\Filesystem\FilePath;
  */
 final readonly class ComponentScanner
 {
+    /**
+     * @param array<string|FilePath> $cssFiles
+     */
     public function scanComponents(array $cssFiles): ComponentRegistry
     {
         $components = [];
@@ -41,13 +44,17 @@ final readonly class ComponentScanner
         return new ComponentRegistry($components);
     }
 
+    /**
+     * @return array<Component>
+     */
     private function extractComponentsFromCss(string $cssContent, string $filePath): array
     {
         $components = [];
         $processedComponents = [];
 
         // Remove comments
-        $cssContent = preg_replace('/\/\*.*?\*\//s', '', $cssContent);
+        $cleanedContent = preg_replace('/\/\*.*?\*\//s', '', $cssContent);
+        $cssContent = $cleanedContent !== null ? $cleanedContent : $cssContent;
 
         // Find all CSS selectors with improved regex that handles nested braces
         preg_match_all('/([^{}]+)\s*{([^{}]*(?:{[^{}]*}[^{}]*)*)}/s', $cssContent, $matches, PREG_SET_ORDER);
@@ -91,8 +98,16 @@ final readonly class ComponentScanner
     private function analyzeSelector(string $selector, string $cssRules, string $filePath): ?Component
     {
         // Clean up selector - remove :where, :is wrappers
-        $selector = preg_replace('/:where\s*\((.*?)\)/', '$1', $selector);
-        $selector = preg_replace('/:is\s*\((.*?)\)/', '$1', $selector);
+        $cleanedSelector = preg_replace('/:where\s*\((.*?)\)/', '$1', $selector);
+        $selector = $cleanedSelector !== null ? $cleanedSelector : $selector;
+
+        $cleanedSelector = preg_replace('/:is\s*\((.*?)\)/', '$1', $selector);
+        $selector = $cleanedSelector !== null ? $cleanedSelector : $selector;
+
+        // Ensure selector is non-empty string
+        if (empty($selector)) {
+            return null;
+        }
 
         // Skip pseudo-elements and certain pseudo-classes
         if (preg_match('/::/', $selector) || preg_match('/:not\(/', $selector)) {