[TASK] Update default template name handling

Resources/Private/TypoScript/Setup/lib.ts

@@ -1,18 +1,25 @@
+# legacy
+
 lib.rootpid = TEXT
 lib.rootpid.data = leveluid : 0
 
-lib.pidRoot = TEXT
-lib.pidRoot.data = leveluid : 0
-
 lib.currentLevel = TEXT
 lib.currentLevel.data = level:1
 
 lib.currentPid = TEXT
 lib.currentPid.data = TSFE:id
 
+# legacy end
+
+lib.pidRoot = TEXT
+lib.pidRoot.data = leveluid : 0
+
 lib.pidCurrent = TEXT
 lib.pidCurrent.data = TSFE:id
 
+lib.level = TEXT
+lib.level.data = level:1
+
 lib.gpvar = COA
 lib.gpvar {
   stdWrap.htmlSpecialChars = 1

Resources/Private/TypoScript/Setup/page.ts

@@ -2,7 +2,19 @@ page = PAGE
 page {
     10 = FLUIDTEMPLATE
     10 {
-        templateName = Base
+        templateName.stdWrap {
+            cObject = TEXT
+            cObject {
+                data = levelfield:-2,backend_layout_next_level,slide
+                override.field = backend_layout
+                split {
+                    token = pagets__
+                    1.current = 1
+                    1.wrap = |
+                }
+            }
+            ifEmpty = Base
+        }
         layoutRootPaths {
             0 = EXT:site_templates/Resources/Private/Layouts
         }