feat: quote detail modal, SteelERP favicon, and notification navigation

- Pipeline page: clicking a supplier quote card opens a modal with full
  line-item breakdown, lead time, payment terms, notes, awarded status,
  and a Compare All Quotes button
- Eager-load supplierQuotes.supplier and supplierQuotes.items in pipeline
  controller to avoid N+1 on the modal data
- Browser tab now shows SteelERP first (SteelERP — Page Name)
- Added SVG favicon matching the sidebar blue-square logo
- Notification clicks now navigate to the relevant page via a dedicated
  /notifications/{id}/go route that marks only that notification as read

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

app/Http/Controllers/Purchase/PurchasePipelineController.php

@@ -35,7 +35,8 @@ class PurchasePipelineController extends Controller
             'items',
             'signature.signedBy',
             'rfqInvitations.supplier',
-            'supplierQuotes',
+            'supplierQuotes.supplier',
+            'supplierQuotes.items',
             'awardedQuote.supplier',
         ]);