feat: add form components and UI elements for enhanced user interaction

- Introduced Form, FormField, FormItem, FormLabel, FormControl, FormDescription, FormMessage components for structured form handling.
- Added Input, Textarea, and Select components for user input.
- Implemented Label and Separator components for better UI organization.
- Created Skeleton component for loading states.
- Developed Toast and Toaster components for user notifications.
- Integrated useToast hook for managing toast notifications.
- Established AI analysis functionality with analyzeJournalWithLocalAI.
- Set up Dexie for local database management with Journal and Task models.
- Configured Supabase client for server-side and browser-side interactions.
- Defined database schema for journals, tasks, chat sessions, and messages with Row Level Security policies.

Co-authored-by: Copilot <copilot@github.com>

components/layout/header.tsx

@@ -0,0 +1,19 @@
+"use client";
+
+import { User } from "lucide-react";
+
+export function Header() {
+  return (
+    <header className="h-16 border-b border-border bg-background flex items-center justify-between px-6 shrink-0">
+      <div className="text-sm text-muted-foreground font-medium">
+        Kişisel Odak Alanı
+      </div>
+      <div className="flex items-center gap-3">
+        <div className="text-sm font-medium">Lokal Kullanıcı</div>
+        <div className="flex items-center justify-center h-9 w-9 bg-muted text-muted-foreground rounded-full">
+          <User className="h-5 w-5" />
+        </div>
+      </div>
+    </header>
+  );
+}