feat: supplier modal wizard, pipeline delete, sidebar cleanup

- Replace two-tab supplier selector with two-step wizard (method select → suppliers → summary)
- Add per-item channel picker (Email / WhatsApp / Both) in By Item mode
- Add confirmation summary step before submitting By Item supplier assignments
- Add type-to-confirm delete on pipeline list rows
- Redirect purchase.requests.index to pipeline (same data, single entry point)
- Remove Purchase Requests from sidebar nav
- Add edit-request-modal, supplier-invite-list components
- Add address coordinates migration for settings_locations

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

database/migrations/2026_05_25_120000_add_address_coordinates_to_settings_locations_table.php

@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('settings_locations', function (Blueprint $table) {
+            $table->string('address', 500)->nullable()->after('name');
+            $table->decimal('latitude', 10, 7)->nullable()->after('address');
+            $table->decimal('longitude', 11, 7)->nullable()->after('latitude');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('settings_locations', function (Blueprint $table) {
+            $table->dropColumn(['address', 'latitude', 'longitude']);
+        });
+    }
+};