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/auth/login.blade.php

@@ -44,4 +44,17 @@
             </x-primary-button>
         </div>
     </form>
+
+    {{-- Dev credentials hint --}}
+    @if(app()->isLocal())
+    <div style="margin-top:1.5rem; padding:0.75rem 1rem; background:#f0f9ff; border:1px solid #bae6fd; border-radius:0.5rem; font-size:0.8rem; color:#0369a1;">
+        <div style="font-weight:600; margin-bottom:0.25rem;">Dev Credentials</div>
+        <div>Email: <span style="font-family:monospace; font-weight:600;">admin@erp.com</span></div>
+        <div>Password: <span style="font-family:monospace; font-weight:600;">password</span></div>
+        <button type="button" onclick="document.getElementById('email').value='[email protected]'; document.getElementById('password').value='password';"
+            style="margin-top:0.5rem; padding:0.25rem 0.75rem; background:#0ea5e9; color:#fff; border:none; border-radius:0.375rem; cursor:pointer; font-size:0.75rem;">
+            Fill in
+        </button>
+    </div>
+    @endif
 </x-guest-layout>