add ability to override frequency per plant and adjust timezone, fix missing workhour for plants

rust/src_webpack/src/timeview.html

@@ -18,4 +18,11 @@
         <div  id="timeview_browser_time"  style="text-wrap: nowrap; flex-grow: 1;">Local time</div>
     </div>
 
+    <div style="display:flex">
+        <span style="min-width: 50px;">Timezone:</span>
+        <select id="timezone_select" style="text-wrap: nowrap; flex-grow: 1;">
+            <option value="" disabled selected>Select Timezone</option>
+        </select>
+    </div>
+
     <button id="timeview_time_upload">Store Browser time into esp and rtc</button>