feat: detect MSIX-virtualized Claude config path + warn (#7)

bcc.py

@@ -1679,6 +1679,22 @@ class MainWindow(QMainWindow):
             self.load_profile(self.profiles[0])
         else:
             self.status.setText('No Claude installs found. Use "Add config…" to point at one.')
+        self._maybe_warn_msix()
+
+    def _maybe_warn_msix(self):
+        """
+        Windows-only, no-op everywhere else: if Claude Desktop looks like an
+        MSIX/Store install with a virtualized config, append a warning to the
+        status bar so edits to the plain %APPDATA% path aren't silently lost.
+        Defensive on purpose -- this must never block startup or profile load.
+        """
+        try:
+            warning = core.msix_warning_text()
+        except Exception:
+            return
+        if warning:
+            self.status.setText(f"{self.status.text()}  ⚠ {warning}")
+            self.status.setToolTip(warning)
 
     def add_custom_config(self):
         start = str(core.app_support_base())