New feature
Fix non-GET clicks using prefetch cache and adding to history.
The "&" character in mu-target and mu-patch-target is replaced by the trigger element's ID selector, enabling relative targeting without server-generated IDs. If the trigger has no ID, one is auto-generated. Useful for reusable components (e.g. mu-target="& > .list").
Debug
Fix non-GET clicks using prefetch cache and adding to history.
Non-GET requests (POST, PUT, PATCH, DELETE) triggered by click on elements with mu-method were incorrectly treated as navigation: served from prefetch cache, stored in cache, and added to browser history. Now prefetch cache is skipped for non-GET methods in _loadExec, and _onClick defaults to history=false for non-GET methods (same as _onSubmit already does for non-GET forms). Also harmonized HTTP method comparisons in _loadExec to use lowercase like the rest of the codebase.