test: prepare playwright tests to ensure avoid regressions on text stemming results

static/index.html

@@ -55,6 +55,7 @@
                     She turned back.
                     <br>
                 </div>
+                <div class="display-none collapse"><span id="id-hidden-editor" aria-label="id-hidden-editor">placehoder</span></div>
             </div>
             
             <div id="id-col2-words-frequency" class="col-flex50 border-blue padding10px margin10px overflow-hidden background-color-lightgray">

static/index.js

@@ -61,6 +61,9 @@ const wordsFrequencyAnalyzers = {
             let nTotalRows = bodyResponseJson["nTotalRows"]
             console.log(`getWordsFreq::nTotalRows: '${nTotalRows}', populateWordsFrequencyTables...`)
             populateWordsFrequencyTables(freq, nTotalRows)
+            // temp until we have the new UI
+            let hiddenOutputSpan = document.getElementById("id-hidden-editor")
+            hiddenOutputSpan.textContent = JSON.stringify(freq, null, 2)
         } catch (err) {
             console.error("getWordsFrequency::err on useWordfreqWebserver:", err, "#")
             setElementCssClassById("waiting-for-be", "display-none")