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.

app/Http/Controllers/InvoiceSettingsController.php

@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers;
+
+use App\Models\InvoiceSettings;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Storage;
+use Illuminate\View\View;
+
+class InvoiceSettingsController extends Controller
+{
+    public function edit(): View
+    {
+        $settings = InvoiceSettings::instance();
+        return view('invoices.settings', compact('settings'));
+    }
+
+    public function update(Request $request): RedirectResponse
+    {
+        $validated = $request->validate([
+            'invoice_prefix'             => 'required|string|max:20',
+            'invoice_next_number'        => 'required|integer|min:1',
+            'header_name'                => 'nullable|string|max:100',
+            'header_title'               => 'nullable|string|max:150',
+            'header_logo'                => 'nullable|image|max:2048',
+            'default_tax_rate'           => 'nullable|numeric|min:0|max:100',
+            'default_currency'           => 'nullable|string|max:10',
+            'default_service_description'=> 'nullable|string|max:255',
+            'default_bank_name'          => 'nullable|string|max:100',
+            'default_branch_name'        => 'nullable|string|max:100',
+            'default_bank_account'       => 'nullable|string|max:50',
+            'default_bank_holder'        => 'nullable|string|max:100',
+            'default_notes'              => 'nullable|string|max:1000',
+        ]);
+
+        $settings = InvoiceSettings::instance();
+
+        if ($request->hasFile('header_logo')) {
+            // Delete old logo if exists
+            if ($settings->header_logo) {
+                Storage::disk('public')->delete($settings->header_logo);
+            }
+            $path = $request->file('header_logo')->store('invoice-logos', 'public');
+            $validated['header_logo'] = $path;
+        }
+
+        $settings->update($validated);
+
+        return redirect()->route('invoice-settings.edit')
+            ->with('success', '🧾 Invoice settings saved!');
+    }
+}