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]>

resources/views/purchase/requests/show.blade.php

@@ -12,7 +12,7 @@
         <a href="{{ route('purchase.requests.print', $purchaseRequest) }}" target="_blank"
            class="btn-primary">Print MPR Form</a>
         @if($purchaseRequest->status === 'pending')
-            <a href="{{ route('purchase.requests.edit', $purchaseRequest) }}" class="btn-secondary">Edit</a>
+            <x-purchase.edit-request-modal :purchaseRequest="$purchaseRequest" />
             <form action="{{ route('purchase.requests.approve', $purchaseRequest) }}" method="POST">
                 @csrf @method('PATCH')
                 <button type="submit" class="btn-success">Approve</button>