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/services/journal_service.py

@@ -23,6 +23,7 @@ from app.models.journal import (
 from app.schemas.journal import (
     JournalAttachmentOut,
     JournalCalendarDay,
+    JournalCalendarEntry,
     JournalCategoryCreate,
     JournalDayDetailItem,
     JournalEntryCreate,
@@ -363,25 +364,33 @@ def get_monthly_journal_summary(
     last_day = date(year, month, days_in_month)
 
     stmt = (
-        select(JournalEntry.entry_date, JournalCategory.color)
+        select(JournalEntry.entry_date, JournalCategory.color, JournalEntry.title, JournalEntry.content)
         .join(JournalCategory, JournalEntry.category_id == JournalCategory.id)
         .where(JournalEntry.user_id == user_id, JournalEntry.entry_date.between(first_day, last_day))
+        .order_by(JournalEntry.entry_date, JournalEntry.created_at)
     )
     if category_id is not None:
         stmt = stmt.where(JournalEntry.category_id == category_id)
     rows = db.execute(stmt).all()
 
     counts: dict[date, int] = {}
-    colors_by_date: dict[date, list[str]] = {}
-    for entry_date, color in rows:
+    entries_by_date: dict[date, list[JournalCalendarEntry]] = {}
+    for entry_date, color, title, content in rows:
         counts[entry_date] = counts.get(entry_date, 0) + 1
-        colors = colors_by_date.setdefault(entry_date, [])
-        color = color or "var(--color-accent)"
-        if color not in colors:
-            colors.append(color)
+        entries = entries_by_date.setdefault(entry_date, [])
+        entries.append(
+            JournalCalendarEntry(
+                color=color or "var(--color-accent)",
+                title=title or (content[:12] + ("…" if len(content) > 12 else "")),
+            )
+        )
 
     return {
-        d: JournalCalendarDay(entry_date=d, total_count=counts[d], category_colors=colors_by_date[d])
+        d: JournalCalendarDay(
+            entry_date=d,
+            total_count=counts[d],
+            entries=entries_by_date[d],
+        )
         for d in counts
     }