Run the desktop's model layer in the browser (#557)

packages/platform/src/index.web.ts

@@ -0,0 +1,23 @@
+import { setPlatform } from "./registry";
+import { createWebPlatform } from "./web";
+
+/**
+ * The package entry for browser builds, selected by aliasing
+ * `@yaakapp-internal/platform` to this file (see `YAAK_TARGET=web` in the
+ * client's vite.config.ts).
+ *
+ * A separate entry rather than a branch inside `index.ts`, because a branch
+ * would still leave `import "@tauri-apps/api"` in the module graph: the folded
+ * `if` disappears, but the imports it guarded do not, and those modules cannot
+ * be proven side-effect free. Splitting the entry means a web build never
+ * mentions Tauri at all — and it keeps `index.ts` exactly as the desktop has
+ * always had it.
+ *
+ * Like `index.ts`, this must install the host eagerly and synchronously:
+ * boot-time modules call commands while the module graph is still evaluating.
+ */
+setPlatform(createWebPlatform());
+
+export * from "./capabilities";
+export { platform, setPlatform } from "./registry";
+export * from "./types";