feat: calendar eco

backend/main.py

@@ -1,4 +1,16 @@
 import os
+import sys
+# Windows consoles default to a legacy codepage (cp1252/cp850) that can't encode
+# the arrows/checkmarks/emojis used throughout this codebase's print() calls —
+# an uncaught UnicodeEncodeError on a background thread (e.g. the calendar sync
+# loop) silently kills that task with no visible error. UTF-8 + replace makes
+# every print() safe regardless of console codepage.
+if sys.platform == "win32":
+    for _stream in (sys.stdout, sys.stderr):
+        try:
+            _stream.reconfigure(encoding="utf-8", errors="replace")
+        except Exception:
+            pass
 from pathlib import Path
 from dotenv import load_dotenv
 # Explicit path: don't rely on the process's current working directory (a systemd