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]>

app/Models/Settings/Location.php

@@ -8,9 +8,9 @@ class Location extends Model
 {
     protected $table = 'settings_locations';
 
-    protected $fillable = ['name', 'project_id', 'is_active'];
+    protected $fillable = ['name', 'project_id', 'is_active', 'address', 'latitude', 'longitude'];
 
-    protected $casts = ['is_active' => 'boolean'];
+    protected $casts = ['is_active' => 'boolean', 'latitude' => 'float', 'longitude' => 'float'];
 
     public function scopeActive($query)
     {