LLM configs: edit/delete buttons available for all rows

Previously gated to tenant-owned rows (tenant_id != null), which made
seed-from-catalog rows uneditable since they default to platform scope
on the backend. The backend doesn't enforce extra ownership rules on
update/delete either, so the gate was a UI overreach.

Buttons now appear on every row. Tooltips clarify when a row is a
platform default so the operator knows the change applies broadly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/components/settings/llm-configurations-panel.tsx

@@ -425,28 +425,26 @@ function ConfigRow({
             aria-label={c.enabled ? "Disable" : "Enable"}
             data-action={`llm-config-enabled-${c.id}`}
           />
-          {c.tenant_id != null ? (
-            <>
-              <Button
-                variant="ghost"
-                size="sm"
-                onClick={onEdit}
-                data-action={`llm-config-edit-${c.id}`}
-                aria-label="Edit"
-              >
-                <Pencil className="size-4" />
-              </Button>
-              <Button
-                variant="ghost"
-                size="sm"
-                onClick={onDelete}
-                data-action={`llm-config-delete-${c.id}`}
-                aria-label="Delete"
-              >
-                <Trash2 className="size-4" />
-              </Button>
-            </>
-          ) : null}
+          <Button
+            variant="ghost"
+            size="sm"
+            onClick={onEdit}
+            data-action={`llm-config-edit-${c.id}`}
+            aria-label="Edit"
+            title={c.tenant_id == null ? "Edit platform default (visible to all tenants)" : "Edit"}
+          >
+            <Pencil className="size-4" />
+          </Button>
+          <Button
+            variant="ghost"
+            size="sm"
+            onClick={onDelete}
+            data-action={`llm-config-delete-${c.id}`}
+            aria-label="Delete"
+            title={c.tenant_id == null ? "Delete platform default" : "Delete"}
+          >
+            <Trash2 className="size-4" />
+          </Button>
         </div>
       </div>
     </li>