refactor: enhance error handling and performance tracking across components

- Improve localStorage access in ActivityFeed, ChatWidget, and AdminPage with try-catch blocks to handle potential errors gracefully.
- Update performance tracking in AnalyticsProvider and analytics.ts to ensure robust error handling and prevent failures from affecting user experience.
- Refactor Web Vitals tracking to include error handling for observer initialization and data collection.
- Ensure consistent handling of hydration mismatches in components like BackgroundBlobs and ChatWidget to improve rendering reliability.

app/components/ChatWidget.tsx

@@ -20,21 +20,47 @@ interface Message {
 }
 
 export default function ChatWidget() {
+  // Prevent hydration mismatch by only rendering after mount
+  const [mounted, setMounted] = useState(false);
   const [isOpen, setIsOpen] = useState(false);
   const [messages, setMessages] = useState<Message[]>([]);
   const [inputValue, setInputValue] = useState("");
   const [isLoading, setIsLoading] = useState(false);
-  const [conversationId, setConversationId] = useState(() => {
-    // Generate or retrieve conversation ID
-    if (typeof window !== "undefined") {
+  const [conversationId, setConversationId] = useState<string>("default");
+
+  useEffect(() => {
+    setMounted(true);
+    // Generate or retrieve conversation ID only on client
+    try {
       const stored = localStorage.getItem("chatSessionId");
-      if (stored) return stored;
-      const newId = crypto.randomUUID();
+      if (stored) {
+        setConversationId(stored);
+        return;
+      }
+      
+      // Generate UUID with fallback for browsers without crypto.randomUUID
+      let newId: string;
+      if (typeof crypto !== "undefined" && crypto.randomUUID) {
+        newId = crypto.randomUUID();
+      } else {
+        // Fallback UUID generation
+        newId = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
+          const r = Math.random() * 16 | 0;
+          const v = c === 'x' ? r : (r & 0x3 | 0x8);
+          return v.toString(16);
+        });
+      }
+      
       localStorage.setItem("chatSessionId", newId);
-      return newId;
+      setConversationId(newId);
+    } catch (error) {
+      // localStorage might be disabled or full
+      if (process.env.NODE_ENV === 'development') {
+        console.warn('Failed to access localStorage for chat session:', error);
+      }
+      setConversationId(`session-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`);
     }
-    return "default";
-  });
+  }, []);
 
   const messagesEndRef = useRef<HTMLDivElement>(null);
   const inputRef = useRef<HTMLInputElement>(null);
@@ -62,22 +88,55 @@ export default function ChatWidget() {
   // Load messages from localStorage
   useEffect(() => {
     if (typeof window !== "undefined") {
-      const stored = localStorage.getItem("chatMessages");
-      if (stored) {
-        try {
-          const parsed = JSON.parse(stored);
-          setMessages(
-            parsed.map((m: Message) => ({
-              ...m,
-              text: decodeHtmlEntities(m.text), // Decode HTML entities when loading
-              timestamp: new Date(m.timestamp),
-            })),
-          );
-        } catch (e) {
-          console.error("Failed to load chat history", e);
+      try {
+        const stored = localStorage.getItem("chatMessages");
+        if (stored) {
+          try {
+            const parsed = JSON.parse(stored);
+            setMessages(
+              parsed.map((m: Message) => ({
+                ...m,
+                text: decodeHtmlEntities(m.text), // Decode HTML entities when loading
+                timestamp: new Date(m.timestamp),
+              })),
+            );
+          } catch (e) {
+            if (process.env.NODE_ENV === 'development') {
+              console.error("Failed to parse chat history", e);
+            }
+            // Clear corrupted data
+            try {
+              localStorage.removeItem("chatMessages");
+            } catch {
+              // Ignore cleanup errors
+            }
+            // Add welcome message
+            setMessages([
+              {
+                id: "welcome",
+                text: "Hi! I'm Dennis's AI assistant. Ask me anything about his skills, projects, or experience! 🚀",
+                sender: "bot",
+                timestamp: new Date(),
+              },
+            ]);
+          }
+        } else {
+          // Add welcome message
+          setMessages([
+            {
+              id: "welcome",
+              text: "Hi! I'm Dennis's AI assistant. Ask me anything about his skills, projects, or experience! 🚀",
+              sender: "bot",
+              timestamp: new Date(),
+            },
+          ]);
         }
-      } else {
-        // Add welcome message
+      } catch (error) {
+        // localStorage might be disabled
+        if (process.env.NODE_ENV === 'development') {
+          console.warn("Failed to load chat history from localStorage:", error);
+        }
+        // Add welcome message anyway
         setMessages([
           {
             id: "welcome",
@@ -93,7 +152,14 @@ export default function ChatWidget() {
   // Save messages to localStorage
   useEffect(() => {
     if (typeof window !== "undefined" && messages.length > 0) {
-      localStorage.setItem("chatMessages", JSON.stringify(messages));
+      try {
+        localStorage.setItem("chatMessages", JSON.stringify(messages));
+      } catch (error) {
+        // localStorage might be full or disabled
+        if (process.env.NODE_ENV === 'development') {
+          console.warn("Failed to save chat messages to localStorage:", error);
+        }
+      }
     }
   }, [messages]);
 
@@ -204,6 +270,11 @@ export default function ChatWidget() {
     ]);
   };
 
+  // Don't render until mounted to prevent hydration mismatch
+  if (!mounted) {
+    return null;
+  }
+
   return (
     <>
       {/* Chat Button */}