feat(windows): add Open data folder button to General tab

windows/freeflow/settings_window.py

@@ -1,4 +1,5 @@
 """Settings window with General and Run Log tabs (tkinter)."""
+import os
 import threading
 import tkinter as tk
 from tkinter import ttk, messagebox
@@ -7,6 +8,7 @@
 
 import sounddevice as sd
 
+from .config import Config
 from .transcription_service import TranscriptionService
 from .models import HotkeyOption
 
@@ -191,6 +193,40 @@ def _on_mousewheel(event: tk.Event) -> None:
             foreground="#9ca3af",
         ).pack(anchor=tk.W, padx=10, pady=(0, 8))
 
+        # --- Data Folder ---
+        data_frame = ttk.LabelFrame(scroll_frame, text="Data Folder")
+        data_frame.pack(fill=tk.X, **pad)
+
+        ttk.Label(
+            data_frame,
+            text="Settings, audio recordings, and history DB live in %APPDATA%\\FreeFlow.",
+            font=("Segoe UI", 9),
+            foreground="#6b7280",
+        ).pack(anchor=tk.W, padx=10, pady=(5, 5))
+
+        ttk.Button(
+            data_frame,
+            text="Open data folder",
+            command=self._open_data_folder,
+        ).pack(anchor=tk.W, padx=10, pady=(0, 8))
+
+    def _open_data_folder(self) -> None:
+        """Open the FreeFlow data folder in Explorer.
+
+        Config._app_data_dir() mkdir's the folder at import time, so it
+        always exists by the time the user clicks this button. os.startfile
+        returns immediately after handing the path to the shell, so the
+        settings window stays responsive while Explorer is open.
+        """
+        try:
+            os.startfile(str(Config.app_data_dir()))
+        except OSError as e:
+            messagebox.showerror(
+                "Open data folder",
+                f"Could not open the data folder:\n{e}",
+                parent=self._root,
+            )
+
     def _build_snippets_tab(self) -> None:
         """Build the Snippets tab for managing voice shortcuts."""
         # Header