add retroactive check for yesterday's missed habits on /today

Users often only realize a habit was missed the next day; a same-day-only
check made it impossible to record it after the fact.

app/templates/partials/yesterday_item.html

@@ -0,0 +1,16 @@
+<div class="habit-item">
+  <div class="habit-item-main">
+    <button
+      type="button"
+      class="check-indicator"
+      hx-post="/today/{{ item.habit_id }}/toggle-yesterday"
+      hx-target="#today-content"
+      hx-swap="innerHTML"
+      aria-label="{{ item.name }} 어제 체크"
+    ></button>
+    <div>
+      <div class="habit-item-name">{{ item.name }}</div>
+      {% if item.condition_text %}<div class="habit-item-condition">{{ item.condition_text }}</div>{% endif %}
+    </div>
+  </div>
+</div>