feat: enhance frontend with new UI components and Tailwind CSS integration

- Added CreateButton and DocumentCard components for document management.
- Implemented tabbed interface for owned and shared documents in Home page.
- Integrated Tailwind CSS for styling and layout improvements.
- Introduced utility functions for class name management.
- Updated package.json with new dependencies for UI components and styling.
- Created PostCSS configuration for Tailwind CSS.
- Refactored Navbar and button components for better usability and design.
- Enhanced document API to include owner_id for document sharing functionality.

backend/internal/store/postgres.go

@@ -68,8 +68,8 @@ func NewPostgresStore(databaseUrl string) (*PostgresStore, error) {
 	if err := db.Ping(); err != nil {
 		return nil, fmt.Errorf("failed to ping database: %w", err)
 	}
-	db.SetMaxOpenConns(25)
-	db.SetMaxIdleConns(5)
+	db.SetMaxOpenConns(200)
+	db.SetMaxIdleConns(50)
 	db.SetConnMaxLifetime(5 * time.Minute)
 	return &PostgresStore{db: db}, nil
 }