fix(timezones): move from utc offsets to timezones

This fixed various issues related to calculating streaks, etc. Now we
appropriately handle time as it was, vs as it is relative to an offset.

templates/pages/settings.tmpl

@@ -51,7 +51,7 @@
       {{ end }}
     </div>
     <div class="flex flex-col grow gap-2 p-4 rounded shadow-lg bg-white dark:bg-gray-700 text-gray-500 dark:text-white">
-      <p class="text-lg font-semibold mb-2">Change Time Offset</p>
+      <p class="text-lg font-semibold mb-2">Change Timezone</p>
       <form class="flex gap-4 flex-col lg:flex-row"
             action="./settings"
             method="POST">
@@ -60,11 +60,11 @@
             {{ template "svg/clock" (dict "Size" 15) }}
           </span>
           <select class="flex-1 appearance-none rounded-none border border-gray-300 w-full py-2 px-4 bg-white text-gray-700 placeholder-gray-400 shadow-sm text-base focus:outline-none focus:ring-2 focus:ring-purple-600 focus:border-transparent"
-                  id="time_offset"
-                  name="time_offset">
-            {{ range $item := getUTCOffsets }}
-            <option {{ if (eq $item.Value $.Data.TimeOffset) }}selected{{ end }} value="{{ $item.Value }}">
-              {{ $item.Name }}
+                  id="timezone"
+                  name="timezone">
+            {{ range $item := getTimeZones }}
+            <option {{ if (eq $item $.Data.Timezone) }}selected{{ end }} value="{{ $item }}">
+              {{ $item }}
             </option>
             {{ end }}
           </select>