Appearance tweaks

actionLogDisplay had white-on-white text in dark mode: I've fixed color to be black now.

added a title for the mini stream display during scans

webapp/src/components/genericComponents/actionLogDisplay.vue

@@ -58,6 +58,7 @@ export default {
   overflow-y: auto;
   overflow-x: auto;
   background-color: white;
+  color: black;
   padding: 0.5em;
   border: 1px solid black;
 }

webapp/src/components/tabContentComponents/slideScanContent.vue

@@ -60,6 +60,9 @@
         </div>
       </div>
       <div v-show="scanning">
+      <h2 v-if="displayImageOnRight">
+        Live stitching preview
+      </h2>
         <mini-stream-display v-if="displayImageOnRight" />
         <action-log-display
           id="log-display"