v2.3.3: fix Discord webhook always failing (Cloudflare blocks Python UA)

Cloudflare protects Discord webhook endpoints and rejects requests
with the default Python urllib User-Agent ('Python-urllib/3.x') with
HTTP 403 + 'error code 1010'. Add a browser-like User-Agent header
to the request.

The onboarding wizard's 'Send Test Message' button (and clock-in/out
push messages) now succeed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -4,6 +4,16 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## [2.3.3] — 2026-04-30
+
+### Fixed
+- **Discord 웹훅 항상 실패하던 문제** (Cloudflare error 1010 / 403 Forbidden)
+  - 원인: Python 기본 User-Agent(`Python-urllib/3.x`)를 Discord/Cloudflare가
+    봇으로 인식해 차단
+  - 수정: `utils/discord_webhook.py`에 브라우저 UA 헤더 추가
+    (`Mozilla/5.0 (Windows NT 10.0; Win64; x64) ClockOutCalculator/2.3`)
+  - 이제 온보딩 위저드의 "테스트 메시지 보내기" + 출퇴근/휴식 push 모두 정상 동작
+
 ## [2.3.2] — 2026-04-30
 
 ### Fixed

core/version.py

@@ -4,4 +4,4 @@
 릴리스 시 이 값을 올린 후 git tag → push.
 CHANGELOG.md의 최상단 항목과 일치시킬 것.
 """
-__version__ = '2.3.2'
+__version__ = '2.3.3'

utils/discord_webhook.py

@@ -10,6 +10,10 @@ import urllib.error
 from datetime import datetime
 from typing import Optional, List
 
+# Discord/Cloudflare는 Python 기본 UA(Python-urllib/3.x)를 봇으로 차단(error 1010).
+# 일반 브라우저 UA로 위장해야 통과.
+USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) ClockOutCalculator/2.3'
+
 # Discord embed 색상 (decimal)
 COLOR_GREEN = 0x57F287
 COLOR_BLUE = 0x5865F2
@@ -49,7 +53,10 @@ def send(webhook_url: str, title: str, description: str,
     data = json.dumps(payload, ensure_ascii=False).encode('utf-8')
     req = urllib.request.Request(
         webhook_url, data=data,
-        headers={'Content-Type': 'application/json; charset=utf-8'},
+        headers={
+            'Content-Type': 'application/json; charset=utf-8',
+            'User-Agent': USER_AGENT,
+        },
         method='POST',
     )
     try: