On my local test site, there are a few ways to get a working home link that styles correctly when current. Using http://path_to_zen_cart/ or index.php or index.php?main_page=index as the internal link all work.
http://path_to_zen_cart without the ending / works as a link but not for styling.
http://path_to_zen_cart/ would be the best form for a home link, as it will give the clean base address when clicked. As an absolute link, it would not, of course, be portable to a clone or test installation without editing.
It took a bunch of experimentation to get code that would handle any working home link for current styling, and it seems I missed one possible version, though I think you could only get that by entering the slash-free link in the ez-page.
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