enlarge journal calendar cells and pair day/title on one line

- calendar-cell-journal: bump min-height 44px -> 76px, scale up date/dot/title font sizes
- journal calendar titles were centered; left-align them
- rework JournalCalendarDay: replace separate category_colors/titles lists
  (mismatched lengths, no way to pair a dot with its title) with a single
  entries list of (color, title) pairs so the dot and its title render on
  the same non-wrapping row per entry

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

app/templates/journal.html

@@ -252,16 +252,19 @@
     {% for d in week %}
     {% set day_summary = summary_map.get(d) %}
     <div
-      class="calendar-cell clickable{{ '' if d.month == month else ' muted' }}"
+      class="calendar-cell calendar-cell-journal clickable{{ '' if d.month == month else ' muted' }}"
       hx-get="/journal/day/{{ d.isoformat() }}"
       hx-target="#day-detail"
       hx-swap="innerHTML"
     >
       <span class="calendar-date">{{ d.day }}</span>
       {% if day_summary %}
-      <span class="journal-day-dots">
-        {% for color in day_summary.category_colors %}
-        <span class="journal-day-dot" style="background: {{ color }};"></span>
+      <span class="journal-day-entries">
+        {% for entry in day_summary.entries %}
+        <span class="journal-day-entry">
+          <span class="journal-day-dot" style="background: {{ entry.color }};"></span>
+          <span class="journal-day-title">{{ entry.title }}</span>
+        </span>
         {% endfor %}
       </span>
       {% endif %}