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/schemas/journal.py

@@ -116,10 +116,15 @@ class JournalAttachmentOut(BaseModel):
     has_thumbnail: bool
 
 
+class JournalCalendarEntry(BaseModel):
+    color: str  # 그 엔트리가 속한 카테고리 색상 (점 표시용)
+    title: str  # 제목(없으면 내용 일부)
+
+
 class JournalCalendarDay(BaseModel):
     entry_date: date
     total_count: int
-    category_colors: list[str]  # 그 날 엔트리가 있는 카테고리들의 색상(점 표시용, 중복 제거)
+    entries: list[JournalCalendarEntry]  # 엔트리별 (색상, 제목) 쌍 — 점과 제목이 한 줄에 붙어 나오도록 1:1로 매칭
 
 
 class JournalDayDetailItem(BaseModel):