Fix list insertion order and prevent runtime error in "Add After" feature #5767
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Description
This PR continues to address issue #5732.
🛠️ Fixes
Corrects the behavior of the "Add After" feature, which previously inserted new lists at the end instead of after the selected list.
Resolves a runtime error caused by a missing or undefined .list-position-input.
Ensures that ReactiveCache.getList is properly used and not replaced by non-reactive selection logic.
🧪 Manual Testing
Verified that adding a list "after" another correctly places it in the expected position.
Confirmed no JavaScript errors appear in the browser console.