Add contract management and invoice settings pages

- Created a new Blade view for managing brand contracts with forms for adding and editing contracts, including client and category selection.
- Implemented success message notifications for contract actions.
- Added a new Blade view for invoice settings, allowing customization of invoice number format, header branding, and default values for new invoices.
- Introduced a new PDF view for generating rate cards with customizable styles based on user profile settings.
- Developed a profile management page for rate cards, enabling users to update their identity, appearance, and visibility settings.

resources/views/layouts/app.blade.php

@@ -75,6 +75,18 @@
             <span class="text-lg shrink-0">👥</span> Clients / CRM
         </a>
 
+        <a href="{{ route('client-categories.index') }}"
+           @click="sidebarOpen = false"
+           class="nav-item {{ request()->routeIs('client-categories.*') ? 'active' : '' }}">
+            <span class="text-lg shrink-0">🏷️</span> Categories
+        </a>
+
+        <a href="{{ route('contracts.index') }}"
+           @click="sidebarOpen = false"
+           class="nav-item {{ request()->routeIs('contracts.*') ? 'active' : '' }}">
+            <span class="text-lg shrink-0">📋</span> Brand Contracts
+        </a>
+
         <a href="{{ route('social-hub.index') }}"
            @click="sidebarOpen = false"
            class="nav-item {{ request()->routeIs('social-hub.*') ? 'active' : '' }}">