Add splash screen and PyInstaller build script

zipbundler.py

@@ -141,6 +141,14 @@ def shortened_stem(stem, max_length=80):
 
 
 def find_ghostscript():
+    bundled_root = getattr(sys, "_MEIPASS", None)
+    if bundled_root:
+        bundled_ghostscript = Path(bundled_root) / "ghostscript"
+        for executable in ("gswin64c.exe", "gswin32c.exe", "gs.exe"):
+            matches = list(bundled_ghostscript.rglob(executable))
+            if matches:
+                return str(matches[0])
+
     for executable in ("gswin64c", "gswin32c", "gs"):
         path = shutil.which(executable)
         if path:
@@ -1432,6 +1440,13 @@ class ZipBundlerApp(ctk.CTk):
 
 def run_gui():
     app = ZipBundlerApp()
+    try:
+        import pyi_splash
+
+        pyi_splash.close()
+    except Exception:
+        pass
+
     app.mainloop()