Add save image browse and external preview

__init__.py

@@ -1,6 +1,7 @@
 from .dumas_image_nodes import (
     NODE_CLASS_MAPPINGS as IMAGE_NODE_CLASS_MAPPINGS,
     NODE_DISPLAY_NAME_MAPPINGS as IMAGE_NODE_DISPLAY_NAME_MAPPINGS,
+    resolve_serve_token,
 )
 from .dumas_json_nodes import (
     NODE_CLASS_MAPPINGS as JSON_NODE_CLASS_MAPPINGS,
@@ -17,4 +18,37 @@ NODE_DISPLAY_NAME_MAPPINGS.update(IMAGE_NODE_DISPLAY_NAME_MAPPINGS)
 
 WEB_DIRECTORY = "./js"
 
+try:
+    import os
+    from aiohttp import web
+    from server import PromptServer
+
+    @PromptServer.instance.routes.get("/dumas/api/save_image/file")
+    async def dumas_save_image_file(request):
+        path = resolve_serve_token(request.query.get("t", ""))
+        if not path or not os.path.isfile(path):
+            return web.Response(status=404, text="unknown or expired preview token")
+        return web.FileResponse(path)
+
+    @PromptServer.instance.routes.get("/dumas/api/pick_directory")
+    async def dumas_pick_directory(_request):
+        try:
+            import tkinter as tk
+            from tkinter import filedialog
+
+            root = tk.Tk()
+            root.withdraw()
+            root.attributes("-topmost", True)
+            selected = filedialog.askdirectory(
+                initialdir=str(_request.query.get("path", "") or "") or None
+            )
+            root.destroy()
+            if not selected:
+                return web.json_response({"ok": False, "cancelled": True})
+            return web.json_response({"ok": True, "path": selected})
+        except Exception as exc:
+            return web.json_response({"ok": False, "message": str(exc)})
+except Exception:
+    pass
+
 __all__ = ["NODE_CLASS_MAPPINGS", "NODE_DISPLAY_NAME_MAPPINGS", "WEB_DIRECTORY"]