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>

lib/db.ts

@@ -0,0 +1,43 @@
+import Dexie, { type Table } from "dexie";
+
+// Veritabanı Modelleri
+export interface Journal {
+  id: string;
+  date: string;
+  mood: string;
+  energy: number;
+  content: string;
+  ai_tags?: string[];
+  ai_sentiment_score?: number;
+  ai_summary?: string;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface Task {
+  id: string;
+  journal_id?: string;
+  title: string;
+  status: "todo" | "in_progress" | "completed";
+  ai_generated: boolean;
+  date: string;
+  created_at: string;
+}
+
+export class MindSpaceDB extends Dexie {
+  journals!: Table<Journal>;
+  tasks!: Table<Task>;
+
+  constructor() {
+    super("MindSpaceDatabase");
+    
+    // Schema tanımlamaları. 
+    // IndexedDB'de sadece indekslenecek (üzerinde arama/sıralama yapılacak) alanları belirtiriz.
+    this.version(1).stores({
+      journals: "id, date, mood",
+      tasks: "id, status, date, journal_id"
+    });
+  }
+}
+
+export const db = new MindSpaceDB();