fix: ganti --after/--before ke --since/--until dengan waktu eksplisit

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

daily_timesheet.py

@@ -151,12 +151,11 @@ def upload_timesheet(session_id: str, entry: dict, user_id: int) -> int:
 # ── Git ───────────────────────────────────────────────────────────────────────
 
 def get_commits_today(repo_path: str, author: str, today: str) -> list[dict]:
-    until = (date.fromisoformat(today) + timedelta(days=1)).isoformat()
     cmd = [
         "git", "-C", repo_path, "log",
         f"--author={author}",
-        f"--after={today}",
-        f"--before={until}",
+        f"--since={today} 00:00:00",
+        f"--until={today} 23:59:59",
         "--format=%h|%ad|%s",
         "--date=format:%Y-%m-%d %H:%M",
     ]