chore: Version auf 6.2.3 heben

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app.py

@@ -51,13 +51,34 @@ CONFIG_FILE = os.path.join(BASE_DIR, "config.json") # Persistente Konfiguration
 USERS_FILE = os.path.join(BASE_DIR, "users.json")   # User-Datenbank
 HISTORY_FILE = os.path.join(BASE_DIR, "history.json") # Aktivitätsverlauf
 
-APP_VERSION = "6.2.2"
+APP_VERSION = "6.2.3"
 UPLOAD_EXTENSIONS = {".jpg", ".jpeg", ".png", ".mp4"}
 
 app = Flask(__name__)
 app.secret_key = "CHANGE_THIS_SECRET!!!"
 app.wsgi_app = ProxyFix(app.wsgi_app, x_for=1, x_proto=1)
 
+def remember_site(site):
+    """Merkt den zuletzt besuchten Standort in der Session."""
+    if site:
+        session["last_site"] = site
+
+
+def current_site_for(cfg, user=None):
+    """Standort für Seiten ohne eigenen Standortbezug (Dashboard, Hilfe,
+       User-Verwaltung, MFA).
+
+       Nimmt den zuletzt besuchten Standort, sonst den ersten *zugänglichen*.
+       Ohne das springt die Standortanzeige im Header auf den global ersten
+       Standort - und der "Übersicht"-Link führt anschliessend dorthin statt
+       zurück zu dem Standort, von dem man kam."""
+    sites = get_accessible_sites(cfg, user) if (user is not None and user.is_authenticated) else get_site_list(cfg)
+    letzter = session.get("last_site")
+    if letzter in sites:
+        return letzter
+    return sites[0] if sites else ""
+
+
 @app.context_processor
 def inject_globals():
     """Stellt globale Template-Variablen für Header/Footer bereit."""
@@ -67,7 +88,7 @@ def inject_globals():
     from flask_login import current_user
     if current_user.is_authenticated:
         site_list = get_accessible_sites(cfg, current_user)
-        current_site_val = get_site_list(cfg)[0] if get_site_list(cfg) else ""
+        current_site_val = current_site_for(cfg, current_user)
     else:
         site_list = get_site_list(cfg)
         current_site_val = site_list[0] if site_list else ""
@@ -863,11 +884,11 @@ def mfa_setup():
             save_users(users_data)
             add_history_entry("mfa_enabled", f"User '{email}' hat MFA aktiviert", email)
             return render_template("mfa_recovery.html", codes=recovery, email=email,
-                                   site_list=site_list, current_site=site_list[0] if site_list else "",
+                                   site_list=site_list, current_site=current_site_for(cfg, current_user),
                                    brand_subtitle="MFA", site_dropdown_url_prefix="/admin/")
         return render_template("mfa_setup.html", error="Code ungültig. Bitte versuche es erneut.",
                                email=email, secret=secret, qr_data=None,
-                               site_list=site_list, current_site=site_list[0] if site_list else "",
+                               site_list=site_list, current_site=current_site_for(cfg, current_user),
                                brand_subtitle="MFA", site_dropdown_url_prefix="/admin/")
 
     uri = totp.provisioning_uri(name=email, issuer_name="CANCOM Signage")
@@ -879,7 +900,7 @@ def mfa_setup():
     return render_template("mfa_setup.html", error=None if not error_param else "Passwort ist falsch",
                            email=email, secret=secret, qr_data=qr_b64,
                            recovered=recovered, disabled=disabled,
-                           site_list=site_list, current_site=site_list[0] if site_list else "",
+                           site_list=site_list, current_site=current_site_for(cfg, current_user),
                            brand_subtitle="MFA", site_dropdown_url_prefix="/admin/")
 
 
@@ -947,6 +968,8 @@ def add_customer():
     if site and not current_user.can_access_site(site):
         abort(403)
 
+    remember_site(site)
+
     if request.method == "POST":
         customer_names = [
             request.form.get("customer_name_1", "").strip(),
@@ -1404,6 +1427,7 @@ def admin(site):
     Admin-Dashboard für einen Standort.
     Zeigt alle Screens als Cards mit Tabler-Tabs (Playlist, Einstellungen, Medien).
     """
+    remember_site(site)
     cfg = load_config()
 
     site_list = get_accessible_sites(cfg, current_user)
@@ -1545,6 +1569,7 @@ def admin(site):
 @site_access_required
 def admin_priority(site):
     """Zeigt die Priority-Playlist-Seite mit Tabs (Playlist + Medien)."""
+    remember_site(site)
     cfg = load_config()
     site_list = get_accessible_sites(cfg, current_user)
     priority_files = load_priority_files(site)
@@ -2087,7 +2112,7 @@ def admin_dashboard():
         superuser_trend=superuser_trend,
         history=history,
         site_list=get_accessible_sites(cfg, current_user),
-        current_site=get_site_list(cfg)[0] if get_site_list(cfg) else "",
+        current_site=current_site_for(cfg, current_user),
         version=APP_VERSION,
         year=datetime.now().year,
         hostname=os.uname().nodename,
@@ -2103,7 +2128,7 @@ def admin_help():
     return render_template(
         "help.html",
         site_list=get_accessible_sites(cfg, current_user),
-        current_site=get_site_list(cfg)[0] if get_site_list(cfg) else "",
+        current_site=current_site_for(cfg, current_user),
         version=APP_VERSION,
         year=datetime.now().year,
         hostname=os.uname().nodename,
@@ -2136,7 +2161,7 @@ def admin_users():
         "user_list.html",
         users=sorted(users_list, key=lambda u: (u["last_name"].lower(), u["first_name"].lower())),
         site_list=get_accessible_sites(cfg, current_user),
-        current_site=get_site_list(cfg)[0] if get_site_list(cfg) else "",
+        current_site=current_site_for(cfg, current_user),
         version=APP_VERSION,
         year=datetime.now().year,
         hostname=os.uname().nodename,