1.4.1: nested pages dirs, CommonJS require of react in client bundles

- Page URL paths are now relative to src/pages. The old greedy
  `.*/pages/` cut mapped src/pages/admin/pages/index.tsx to /index, so
  every page under a nested `pages` directory collided with the home page
  and was never bundled. SSR also tells API routes by URL path now.
- CommonJS `require("react…")` in client bundles (for example
  use-sync-external-store/shim, pulled in by MUI) threw "Dynamic require
  of "react" is not supported" in the browser. Those requires now go
  through a small bundled ESM module that imports the external.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

dist/functions/bundler/all-pages-esbuild-context-bundler.d.ts

@@ -1,3 +1,4 @@
+import * as esbuild from "esbuild";
 import type { BundlerCTXMap } from "../../types";
 type Params = {
     post_build_fn?: (params: {
@@ -17,4 +18,13 @@ type Params = {
  */
 export declare function isHydrationEntryPage(local_path: string): boolean;
 export default function allPagesESBuildContextBundler(params?: Params): Promise<void>;
+/**
+ * CommonJS `require("react")` (e.g. `use-sync-external-store/shim`, pulled
+ * in by MUI) for a module that is external in ESM output becomes esbuild's
+ * `__require`, which throws "Dynamic require of "react" is not supported" in
+ * the browser. Give those requires a small bundled ESM module that imports
+ * the external instead; esbuild wires `require()` to it.
+ */
+export declare function externalRequireShim(specifier: string): string;
+export declare function forceExternalReact(): esbuild.Plugin;
 export {};