fix: brain search — Meilisearch settings use PATCH not PUT

Settings were failing with 405 (PUT not supported in Meilisearch v1.12).
Changed to PATCH. Filterable/searchable attributes now applied.
Keyword search working: wedding, yusuf, insurance, airport all return results.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend-v2/src/lib/pages/brain/AtelierBrainPage.svelte

@@ -920,10 +920,10 @@
 
   .viewer-layout {
     display: grid;
-    grid-template-columns: 1fr 300px;
-    width: 90vw;
-    max-width: 1100px;
-    height: 80vh;
+    grid-template-columns: 1fr 440px;
+    width: 94vw;
+    max-width: 1300px;
+    height: 85vh;
     border-radius: 24px;
     overflow: hidden;
     box-shadow: 0 32px 80px rgba(18,13,10,0.3);
@@ -961,11 +961,11 @@
   .viewer-sidebar {
     background: linear-gradient(180deg, #f8f1e8 0%, #f3eadc 100%);
     border-left: 1px solid rgba(35,26,17,0.08);
-    padding: 22px;
+    padding: 28px;
     overflow-y: auto;
     display: flex;
     flex-direction: column;
-    gap: 14px;
+    gap: 18px;
   }
 
   .viewer-sidebar-header {