feat: open focused blockers from Today HUD (Closes #1070)

frontend/index.html

@@ -1537,6 +1537,7 @@
   <div class="small" data-work-session-progress aria-live="polite"></div>
   <button data-mobile-today-toggle data-work-session-timer-toggle type="button">Pause timer</button>
   <button data-mobile-today-update type="button" hidden>Add update</button>
+  <button class="mobile-today-blocked" data-mobile-today-blocked type="button" hidden>Blocked</button>
   <button data-today-break-open type="button">Take break</button>
   <button data-work-session-adjust-plan type="button" hidden>Adjust remaining plan</button>
 </section>
@@ -1556,7 +1557,7 @@
         <button id="load-older-today-progress-activity" type="button" hidden>Load older</button>
       </div>
     </section>
-    <label for="today-progress-body">Update</label>
+    <label id="today-progress-body-label" for="today-progress-body">Update</label>
     <textarea id="today-progress-body" rows="5" maxlength="2000" placeholder="What changed, what you learned, or what comes next"></textarea>
     <div class="mention-options" id="today-progress-body-mentions" role="listbox" aria-label="Teammates" hidden></div>
     <div class="mention-status small" id="today-progress-body-mention-status" aria-live="polite"></div>
@@ -1600,12 +1601,17 @@
         </div>
       </div>
     </section>
-    <p class="small muted">Save privately on this device, or post to the exact Gitea item. Today keeps running either way.</p>
+    <p class="small muted today-progress-update-help">Save privately on this device, or post to the exact Gitea item. Today keeps running either way.</p>
     <section class="today-progress-blocker" aria-labelledby="today-progress-blocker-title">
       <strong id="today-progress-blocker-title">Blocked?</strong>
       <p id="today-progress-blocker-recovery" class="today-progress-blocker-recovery small" role="status" hidden></p>
       <label for="today-blocker-return-at">Return this item to Later at</label>
       <input id="today-blocker-return-at" type="datetime-local" />
+      <div class="today-blocker-presets" aria-label="Return time choices">
+        <button data-today-blocker-preset="later-today" type="button">Later today</button>
+        <button data-today-blocker-preset="tomorrow" type="button">Tomorrow</button>
+        <button data-today-blocker-custom type="button">Choose time</button>
+      </div>
       <button id="post-today-blocker" type="button">Post blocker &amp; move on</button>
       <p class="small muted">Posts this update first, then defers the item and continues Today.</p>
     </section>