feat: add prominent header with logo, app title and version

- Create dedicated header section with professional layout
- Display large logo (48x48) next to application title
- Show 'Bash-Script-Maker' title in large bold font (24pt)
- Add version number and descriptive subtitle
- Include startup date as additional context
- Implement visual separator between header and toolbar
- Maintain fallback options for logo display (PIL, emoji, text)
- Enhance overall professional appearance and branding

Author: marci

bash_script_maker.py

@@ -481,6 +481,92 @@ def add_logo_to_toolbar(self, toolbar):
             except:
                 pass
 
+    def create_header(self):
+        """Erstellt den Header-Bereich mit Logo, App-Titel und Version"""
+        header_frame = ttk.Frame(self.root, bootstyle="primary")
+        header_frame.pack(side=tk.TOP, fill=tk.X, padx=5, pady=(5, 10))
+        
+        # Header-Container für bessere Kontrolle
+        header_container = ttk.Frame(header_frame)
+        header_container.pack(fill=tk.X, padx=15, pady=10)
+        
+        # Logo (links)
+        logo_frame = ttk.Frame(header_container)
+        logo_frame.pack(side=tk.LEFT)
+        
+        try:
+            script_dir = os.path.dirname(os.path.abspath(__file__))
+            logo_path = os.path.join(script_dir, "assets", "bash-script-maker-48.png")
+            
+            if os.path.exists(logo_path):
+                try:
+                    from PIL import Image, ImageTk
+                    
+                    # Logo für Header (48x48)
+                    img = Image.open(logo_path)
+                    logo_photo = ImageTk.PhotoImage(img)
+                    
+                    logo_label = ttk.Label(logo_frame, image=logo_photo)
+                    logo_label.image = logo_photo  # Referenz behalten
+                    logo_label.pack(side=tk.LEFT, padx=(0, 15))
+                    
+                except ImportError:
+                    # Fallback: Großes Emoji
+                    logo_label = ttk.Label(logo_frame, text="🖥️", font=("Arial", 36))
+                    logo_label.pack(side=tk.LEFT, padx=(0, 15))
+            else:
+                # Fallback: Emoji
+                logo_label = ttk.Label(logo_frame, text="🖥️", font=("Arial", 36))
+                logo_label.pack(side=tk.LEFT, padx=(0, 15))
+                
+        except Exception as e:
+            print(f"Fehler beim Laden des Header-Logos: {e}")
+            # Minimaler Fallback
+            logo_label = ttk.Label(logo_frame, text="🖥️", font=("Arial", 24))
+            logo_label.pack(side=tk.LEFT, padx=(0, 15))
+        
+        # Titel und Version (mittig-links)
+        title_frame = ttk.Frame(header_container)
+        title_frame.pack(side=tk.LEFT, fill=tk.X, expand=True)
+        
+        # Haupttitel
+        title_label = ttk.Label(
+            title_frame,
+            text="Bash-Script-Maker",
+            font=("Arial", 24, "bold"),
+            bootstyle="inverse-primary"
+        )
+        title_label.pack(anchor=tk.W)
+        
+        # Untertitel mit Version
+        subtitle_label = ttk.Label(
+            title_frame,
+            text=f"Version {__version__} - Professioneller Bash-Script-Generator",
+            font=("Arial", 11),
+            bootstyle="inverse-secondary"
+        )
+        subtitle_label.pack(anchor=tk.W, pady=(2, 0))
+        
+        # Status-Info (rechts)
+        status_frame = ttk.Frame(header_container)
+        status_frame.pack(side=tk.RIGHT)
+        
+        # Aktuelle Zeit/Datum als zusätzliche Info
+        import datetime
+        current_time = datetime.datetime.now().strftime("%d.%m.%Y")
+        
+        info_label = ttk.Label(
+            status_frame,
+            text=f"Gestartet: {current_time}",
+            font=("Arial", 9),
+            bootstyle="inverse-secondary"
+        )
+        info_label.pack(anchor=tk.E)
+        
+        # Separator-Linie unter dem Header
+        separator = ttk.Separator(self.root, orient=tk.HORIZONTAL)
+        separator.pack(side=tk.TOP, fill=tk.X, padx=5)
+
     def create_menu(self):
         """Erstellt das Menü der Anwendung"""
         menubar = tk.Menu(self.root)
@@ -601,12 +687,12 @@ def create_main_interface(self):
         )
         status_bar.pack(side=tk.BOTTOM, fill=tk.X)
 
-        # Toolbar ganz oben platzieren
-        toolbar = ttk.Frame(self.root)
-        toolbar.pack(side=tk.TOP, fill=tk.X, padx=5, pady=(5, 0))
+        # Header-Bereich für App-Titel und Logo
+        self.create_header()
 
-        # Logo hinzufügen (links)
-        self.add_logo_to_toolbar(toolbar)
+        # Toolbar für Buttons
+        toolbar = ttk.Frame(self.root)
+        toolbar.pack(side=tk.TOP, fill=tk.X, padx=5, pady=(0, 0))
 
         # Toolbar-Inhalte - LINKS
         btn_new = ttk.Button(