implement shims

shims/electron/remote/shell.js

@@ -0,0 +1,20 @@
+// Shim for remote.shell
+// Obsidian uses: openExternal, openPath, showItemInFolder
+
+export const shellShim = {
+  openExternal(url) {
+    window.open(url, '_blank');
+    return Promise.resolve();
+  },
+
+  openPath(filePath) {
+    // TODO: could trigger a server-side download or preview
+    console.log('[shim:shell] openPath (stub):', filePath);
+    return Promise.resolve('');
+  },
+
+  showItemInFolder(filePath) {
+    // No OS file manager in browser context
+    console.log('[shim:shell] showItemInFolder (stub):', filePath);
+  },
+};