windows app: 'Open in VS Code' menu item (parity with the Mac app)

Adds Open in VS Code next to Run Claude Code in Terminal. Finds Code.exe (user
then machine install) and launches it with ANTHROPIC_BASE_URL/AUTH_TOKEN in the
process env (UseShellExecute=false so the Environment dict applies), opening a
%USERPROFILE%\fauxclaude-test workspace via a dedicated --user-data-dir so it's
a separate instance that inherits the env even when VS Code is already running.
Claude Code reads the endpoint from the process env, not settings.json, so it
must be set at launch. Compile-checked with EnableWindowsTargeting on macOS
(0 errors); needs a real Windows run to confirm.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: garthvh

windows-app/Program.cs

@@ -76,6 +76,7 @@ public TrayApp()
 
         menu.Items.Add("Open Dashboard", null, (_, _) => OpenUrl($"{ShimUrl}/"));
         menu.Items.Add("Run Claude Code in Terminal", null, (_, _) => RunClaude());
+        menu.Items.Add("Open in VS Code", null, (_, _) => OpenVSCode());
         menu.Items.Add("View Log", null, (_, _) => OpenLog());
         menu.Items.Add("Edit Model Map…", null, (_, _) => EditModelMap());
         menu.Items.Add(new ToolStripSeparator());
@@ -252,6 +253,56 @@ private void RunClaude()
         }
     }
 
+    // Open VS Code pointed at the shim. Claude Code (CLI or the VS Code extension)
+    // reads ANTHROPIC_BASE_URL from its PROCESS environment — settings.json can't
+    // redirect it — so we launch VS Code with the env set. A dedicated
+    // --user-data-dir makes it a separate instance that reliably inherits the env
+    // even if VS Code is already open (extensions are shared from the default
+    // location). The shim ignores auth, so a dummy token stands in for the login.
+    private void OpenVSCode()
+    {
+        if (_shim is not { HasExited: false } && !_running) StartShim();
+
+        var ws = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "fauxclaude-test");
+        Directory.CreateDirectory(ws);
+        var readme = Path.Combine(ws, "README.md");
+        if (!File.Exists(readme))
+            try { File.WriteAllText(readme, $"# FauxClaude local test workspace\r\n\r\nClaude Code here talks to your local FauxClaude shim ({ShimUrl}).\r\n"); }
+            catch { /* best effort */ }
+
+        // Find Code.exe (user install first, then machine-wide).
+        var lad = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        string? code = null;
+        foreach (var c in new[]
+        {
+            Path.Combine(lad, "Programs", "Microsoft VS Code", "Code.exe"),
+            Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles), "Microsoft VS Code", "Code.exe"),
+            Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86), "Microsoft VS Code", "Code.exe"),
+        })
+            if (File.Exists(c)) { code = c; break; }
+
+        if (code == null)
+        {
+            MessageBox.Show($"VS Code (Code.exe) not found. Install it, or open this folder manually with " +
+                            $"ANTHROPIC_BASE_URL={ShimUrl} set:\n\n{ws}", "FauxClaude");
+            return;
+        }
+
+        var profile = Path.Combine(ws, ".vscode-profile");
+        // UseShellExecute must be false so the Environment dictionary is applied.
+        var psi = new ProcessStartInfo(code)
+        {
+            UseShellExecute = false,
+            Arguments = $"\"{ws}\" --new-window --user-data-dir \"{profile}\"",
+        };
+        psi.Environment.Remove("ANTHROPIC_API_KEY");
+        psi.Environment["ANTHROPIC_BASE_URL"] = ShimUrl;
+        psi.Environment["ANTHROPIC_AUTH_TOKEN"] = "local"; // shim ignores auth; satisfies the client
+        psi.Environment["CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC"] = "1";
+        try { Process.Start(psi); }
+        catch (Exception ex) { MessageBox.Show($"Couldn't open VS Code:\n{ex.Message}", "FauxClaude"); }
+    }
+
     private void ExitApp()
     {
         StopShim();