error pages

app.py

@@ -19,9 +19,24 @@ app = Flask(__name__)
 app.config["SECRET_KEY"] = config.FLASK_CONFIG["secret_key"]
 app.config["SEND_FILE_MAX_AGE_DEFAULT"] = config.FLASK_CONFIG.get("static_cache_timeout", 60)
 
-# Bez Eventlet – tryb wątkowy
 socketio = SocketIO(app, cors_allowed_origins="*", async_mode="threading", logger=False)
 
+@app.errorhandler(500)
+def server_error(error):
+    app.logger.error(f'Server error: {str(error)}')
+    return render_template('error.html', 
+                          status=500,
+                          title='Błąd serwera',
+                          message='Spróbuj ponownie za chwilę.',
+                          footer=config.FOOTER), 500 
+@app.errorhandler(400)
+@app.errorhandler(404)
+def client_error(error):
+    return render_template('error.html', 
+                          status=error.code, 
+                          title=f'Błąd {error.code}',
+                          message='Nieprawidłowe żądanie.',
+                          footer=config.FOOTER), error.code 
 
 # --------------------
 # Helpers
@@ -155,9 +170,16 @@ def favicon():
 
 @app.route("/")
 def index():
+    safe_phases = {
+        k: {
+            'label': v['label'], 
+            'color': v['color']
+        }
+        for k, v in config.PHASES.items()
+    }
     return render_template(
         "index.html",
-        phases=config.PHASES,
+        phases=safe_phases,
         time_ranges=config.TIME_RANGES,
         default_range=config.DEFAULT_TIME_RANGE,
         footer=config.FOOTER,