feat: resume interrupted Today sessions (#395)

frontend/index.html

@@ -50,6 +50,8 @@
       <div class="my-work-actions">
         <button class="plan-today" id="plan-today" type="button">Plan Today</button>
         <button class="start-work-session" id="start-work-session" type="button">Start work</button>
+        <button class="resume-today-session" id="resume-today-session" type="button" hidden>Resume Today</button>
+        <button class="end-today-session" id="end-today-session" type="button" hidden>End session</button>
         <button class="find-work-action" id="find-work" type="button">Find work</button>
         <button class="new-issue" id="new-issue" type="button">New issue</button>
       </div>