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/pipeline/index.blade.php

@@ -14,10 +14,7 @@
     <h1 style="font-size:22px;font-weight:700;color:#0f172a;">Purchase Pipeline</h1>
     <p style="font-size:13px;color:#64748b;margin-top:3px;">Track every purchase from request to payment</p>
   </div>
-  <a href="{{ route('purchase.requests.create') }}"
-     style="padding:10px 22px;background:#2563eb;color:#fff;border-radius:9px;font-size:13px;font-weight:700;text-decoration:none;">
-    + New Request
-  </a>
+  <x-purchase.request-modal />
 </div>
 
 {{-- Tabs --}}