fix(ui): detect VS Code from bootstrap config in shared runtime helpers

d2efa707 fixed projects-store detection via __VSCODE_CONFIG__, but
lib/desktop.isVSCodeRuntime (used by useDirectoryStore) still required
RuntimeAPIs. At webview startup that left directory init on stale
localStorage paths from other windows (#2359).

Share bootstrap detection in lib/vscodeBootstrap and use it from both
desktop runtime checks and the projects-store helper.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/ui/src/lib/vscodeBootstrap.ts

@@ -0,0 +1,20 @@
+/**
+ * Extension-host bootstrap config injected into the VS Code webview HTML
+ * before any bundled module evaluates. Prefer this over RuntimeAPIs for
+ * early VS Code detection during store module initialization.
+ */
+export interface VSCodeBootstrapConfig {
+  workspaceFolder?: unknown;
+  workspaceFolders?: unknown;
+}
+
+export const getVSCodeBootstrapConfig = (): VSCodeBootstrapConfig | null => {
+  if (typeof window === 'undefined') {
+    return null;
+  }
+  return (window as unknown as { __VSCODE_CONFIG__?: VSCodeBootstrapConfig }).__VSCODE_CONFIG__ ?? null;
+};
+
+export const isVSCodeBootstrapPresent = (
+  bootstrapConfig: VSCodeBootstrapConfig | null = getVSCodeBootstrapConfig(),
+): boolean => Boolean(bootstrapConfig);