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

apps/yaak-client/vite.config.ts

@@ -17,9 +17,37 @@ const standardFontsDir = normalizePath(
   path.join(path.dirname(require.resolve("pdfjs-dist/package.json")), "standard_fonts"),
 );
 
+/**
+ * Which host the platform package installs. `web` builds Yaak to run in a plain
+ * browser tab, with its own IndexedDB store instead of the Rust engine; anything
+ * else builds the desktop app exactly as before.
+ */
+const yaakTarget = process.env.YAAK_TARGET === "web" ? "web" : "desktop";
+
 // https://vitejs.dev/config/
 export default defineConfig(async () => {
   return {
+    resolve: {
+      alias:
+        yaakTarget === "web"
+          ? {
+              // Resolve the platform package to its browser entry, so a web
+              // build never pulls `@tauri-apps/*` into the graph at all. A
+              // build-time branch inside the package would not manage that:
+              // the dead branch folds away, but the imports it guarded stay.
+              "@yaakapp-internal/platform": path.resolve(
+                import.meta.dirname,
+                "../../packages/platform/src/index.web.ts",
+              ),
+            }
+          : {},
+    },
+    // The browser host runs the model layer in a worker; that bundle needs the
+    // same wasm and top-level-await handling as the main one.
+    worker: {
+      format: "es" as const,
+      plugins: () => [wasm(), topLevelAwait()],
+    },
     plugins: [
       wasm(),
       tanstackRouter({