add day-detail view to monthly history calendar

날짜 셀 클릭 시 그 날 예정된 습관별 완료/실패/미완료 상태를 htmx로 불러와 보여준다.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/templates/history.html

@@ -32,8 +32,11 @@
     {% for d in week %}
     {% set summary = summary_map.get(d) %}
     <div
-      class="calendar-cell{{ '' if d.month == month else ' muted' }}"
+      class="calendar-cell clickable{{ '' if d.month == month else ' muted' }}"
       style="background: rgba(var(--color-accent-rgb), {{ heatmap_opacity(summary.checked_count, summary.scheduled_count) if summary else 0 }});"
+      hx-get="/history/day/{{ d.isoformat() }}"
+      hx-target="#day-detail"
+      hx-swap="innerHTML"
     >
       <span class="calendar-date">{{ d.day }}</span>
       {% if summary and summary.scheduled_count %}
@@ -45,6 +48,8 @@
   {% endfor %}
 </div>
 
+<div id="day-detail"></div>
+
 {% else %}
 <div class="card" style="overflow-x:auto;">
   <div style="display:flex; align-items:center; justify-content:space-between; margin-bottom: var(--space-2);">

app/templates/partials/day_detail.html

@@ -0,0 +1,30 @@
+{% set weekday_names = ["월", "화", "수", "목", "금", "토", "일"] %}
+<div class="card day-detail-card">
+  <div style="display:flex; align-items:center; justify-content:space-between; margin-bottom: var(--space-2);">
+    <h3 style="margin:0;">{{ log_date.strftime("%Y.%m.%d") }} ({{ weekday_names[log_date.weekday()] }})</h3>
+    <button type="button" class="btn btn-secondary" onclick="document.getElementById('day-detail').innerHTML=''">닫기</button>
+  </div>
+  {% if items %}
+  <div class="day-detail-list">
+    {% for item in items %}
+    <div class="day-detail-item">
+      <span>
+        {{ item.name }}
+        <span class="badge">{{ "형성" if item.habit_type == "build" else "중단" }}</span>
+      </span>
+      {% if item.status == "checked" %}
+      <span class="badge day-detail-status-checked">완료</span>
+      {% elif item.status == "failed" %}
+      <span class="badge day-detail-status-missed">실패</span>
+      {% elif item.status == "missed" %}
+      <span class="badge day-detail-status-missed">미완료</span>
+      {% else %}
+      <span class="badge">예정</span>
+      {% endif %}
+    </div>
+    {% endfor %}
+  </div>
+  {% else %}
+  <div class="empty-state">이 날 예정된 습관이 없어요.</div>
+  {% endif %}
+</div>