feat: Add cross-platform file path selection for password files

src/streamlit_app.py

@@ -33,6 +33,43 @@ def save_uploaded_file(uploaded_file):
         tmp_file.write(uploaded_file.getvalue())
         return tmp_file.name
 
+def get_file_path(title="Select File", file_types=[("Text Files", "*.txt")]):
+    """Get file path using native file dialog when possible"""
+    try:
+        if platform.system() == "Windows":
+            import tkinter as tk
+            from tkinter import filedialog
+            root = tk.Tk()
+            root.withdraw()  # Hide the main window
+            root.attributes('-topmost', True)  # Bring dialog to front
+            path = filedialog.askopenfilename(title=title, filetypes=file_types)
+            return path if path else None
+        elif platform.system() == "Linux":
+            # Use zenity for Linux systems
+            try:
+                result = subprocess.run(
+                    ['zenity', '--file-selection', '--title', title],
+                    capture_output=True,
+                    text=True
+                )
+                return result.stdout.strip() if result.returncode == 0 else None
+            except FileNotFoundError:
+                return None
+        elif platform.system() == "Darwin":  # macOS
+            try:
+                result = subprocess.run(
+                    ['osascript', '-e', f'choose file with prompt "{title}"'],
+                    capture_output=True,
+                    text=True
+                )
+                return result.stdout.strip() if result.returncode == 0 else None
+            except FileNotFoundError:
+                return None
+    except Exception as e:
+        st.error(f"Error opening file dialog: {str(e)}")
+        return None
+    return None
+
 def get_directory_path(title="Select Directory"):
     """Get directory path using native file dialog when possible"""
     try:
@@ -157,20 +194,10 @@ with col2:
                                             value=st.session_state.get('password_path', ''))
                 password_browse = st.button("Browse Password File")
                 if password_browse:
-                    try:
-                        import tkinter as tk
-                        from tkinter import filedialog
-                        root = tk.Tk()
-                        root.withdraw()
-                        file_path = filedialog.askopenfilename(
-                            title="Select Password File",
-                            filetypes=[("Text Files", "*.txt")]
-                        )
-                        if file_path:
-                            st.session_state['password_path'] = file_path
-                            st.experimental_rerun()
-                    except Exception as e:
-                        st.error(f"Error opening file dialog: {str(e)}")
+                    path = get_file_path("Select Password File", [("Text Files", "*.txt")])
+                    if path:
+                        st.session_state['password_path'] = path
+                        st.experimental_rerun()
                 
                 if password_path and os.path.exists(password_path):
                     with open(password_path, 'r', encoding='utf-8') as pf: