feat(console-web): replace TanStack UI with Solid host pages

- move the management frontend under the wasmeld-console crate
- use a persistent Host shell with disposable iframe page documents
- version Host/Page postMessage state and command contracts
- migrate runtime, service, WIT, invocation, and settings workflows
- add Tailwind CSS v4, responsive layouts, and Host-owned dialogs
- emit a dependency-free PWA worker with API cache exclusions
- remove the superseded root TanStack Start application

crates/wasmeld-console/web/src/primitives/create-frame-bridge.ts

@@ -0,0 +1,40 @@
+import { createSignal, onCleanup, onMount } from "solid-js";
+import type { View } from "../lib/model";
+import { isHostMessage, type HostSharedState, type PageCommand } from "../sdk/protocol";
+import { notifyReady, sendCommand } from "../sdk/page";
+
+/**
+ * Connects one iframe document to the persistent Host Shell.
+ *
+ * The listener and state belong to the iframe's Solid owner. Navigating or
+ * removing the iframe runs `onCleanup`, so the old document cannot continue to
+ * receive Host snapshots.
+ */
+export function createFrameBridge(view: View) {
+  const [state, setState] = createSignal<HostSharedState | null>(null);
+
+  const receive = (event: MessageEvent<unknown>) => {
+    if (event.origin !== window.location.origin || event.source !== window.parent) return;
+    if (!isHostMessage(event.data)) return;
+    if (event.data.type === "state" && event.data.state.view === view) {
+      setState(event.data.state);
+    }
+    if (event.data.type === "dispose") {
+      window.dispatchEvent(new Event("wasmeld:dispose"));
+    }
+  };
+
+  onMount(() => {
+    window.addEventListener("message", receive);
+    notifyReady(view);
+  });
+
+  onCleanup(() => window.removeEventListener("message", receive));
+
+  return {
+    state,
+    command(command: PageCommand) {
+      sendCommand(view, command);
+    },
+  };
+}