fix: test connection reads form values instead of saved config

The "Kapcsolat tesztelése" button sent an empty POST to /settings/test,
which read from the (possibly empty) config file on disk. Now sends the
current form values so testing works before clicking Save.

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

app/main.py

@@ -50,12 +50,13 @@ def settings():
 
 @app.route("/settings/test", methods=["POST"])
 def settings_test():
-    """AJAX endpoint — test Mealie connection."""
-    cfg = config.load()
-    if not cfg.get("mealie_url") or not cfg.get("mealie_api_key"):
+    """AJAX endpoint — test Mealie connection using form values."""
+    url = (request.form.get("mealie_url") or "").strip().rstrip("/")
+    key = (request.form.get("mealie_api_key") or "").strip()
+    if not url or not key:
         return jsonify({"ok": False, "error": "Nincs megadva Mealie URL vagy API kulcs."})
     try:
-        client = MealieClient(cfg["mealie_url"], cfg["mealie_api_key"])
+        client = MealieClient(url, key)
         info = client.test_connection()
         return jsonify({"ok": True, "data": info})
     except Exception as exc: