[Housekeeping] Improve test stability (#232)

* Ensured all tests use at least the DataCase module

* addressed one flakey test

* More flakey tests

* Consolidated Mox usage

lib/pinchflat_web/components/layouts/partials/sidebar.html.heex

@@ -18,7 +18,9 @@
     </div>
     <div class="no-scrollbar flex flex-col overflow-y-auto duration-300 ease-linear">
       <nav class="mt-3 px-4 py-4 lg:px-6">
-        <h3 class="mb-4 ml-4 text-sm font-medium text-bodydark2">MENU</h3>
+        <h3 class="mb-4 ml-4 text-sm font-medium text-bodydark2">
+          <span>MENU</span>
+        </h3>
         <div class="flex flex-col justify-between">
           <ul class="mb-6 flex flex-col gap-1.5">
             <.sidebar_item icon="hero-home" text="Home" href={~p"/"} />