feat: Enable uncommon word highlighting by default

This commit updates the uncommon word highlighting feature to be enabled by default when the page loads.

Changes:
- Modified `index.html` to add the `checked` attribute to the 'enableWordCheck' checkbox.
- Modified `js/src/htmlHelper.js` to ensure `refreshPreparedAbstract()` is called during the initial page load sequence, which processes the abstract with the feature enabled by default.

This responds to your feedback requesting the feature to be active without requiring an initial click.

Author: google-labs-jules[bot]

index.html

@@ -83,7 +83,7 @@ <h2>Your Raw Abstract.</h2>
 																																																		
 copied from the PDF or LaTeX source!" id="abstractTextarea" class="form-control"></textarea>
 <p><div class="control-group"><button type="button" class="btn btn-default" onClick="clearAbstract();">Clear Abstract.</button><label style="margin-left: 10px;">
-    <input type="checkbox" id="enableWordCheck"> Underline uncommon words
+    <input type="checkbox" id="enableWordCheck" checked> Underline uncommon words
   </label></div></p>
         </div>
         <div class="col-md-6">

js/src/htmlHelper.js

@@ -127,6 +127,7 @@ $(function() {
         $('#formattedAbstract').selectText();
     });
     formatAbstractFromURL();
+    refreshPreparedAbstract(); // Add this new call
 });
 
 $('#prepared').hover(