default browse dialog to project directory

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

plugins/pin_validator_action.py

@@ -126,16 +126,9 @@ class _SetupDialog(wx.Dialog):
             self.ioc_path = self._history[idx]
 
     def _on_browse(self, _evt):
-        start = self._project_dir
-        for _ in range(4):
-            up = os.path.dirname(start)
-            if up == start:
-                break
-            start = up
-
         dlg = wx.FileDialog(
             self, "Select STM32CubeMX .ioc file",
-            defaultDir=start,
+            defaultDir=self._project_dir,
             wildcard="IOC files (*.ioc)|*.ioc|All files (*.*)|*.*",
             style=wx.FD_OPEN | wx.FD_FILE_MUST_EXIST,
         )