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- remove the superseded root TanStack Start application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/tests/build-output.test.mjs

@@ -0,0 +1,23 @@
+import assert from "node:assert/strict";
+import { readFile, stat } from "node:fs/promises";
+import test from "node:test";
+
+test("build emits independent host and iframe documents", async () => {
+  const [host, page] = await Promise.all([
+    readFile(new URL("../dist/index.html", import.meta.url), "utf8"),
+    readFile(new URL("../dist/page.html", import.meta.url), "utf8"),
+  ]);
+
+  assert.match(host, /Wasmeld Console/);
+  assert.match(page, /Wasmeld Console Page/);
+  assert.notEqual(host, page);
+});
+
+test("build emits an installable PWA worker and manifest", async () => {
+  const manifest = JSON.parse(
+    await readFile(new URL("../dist/manifest.webmanifest", import.meta.url), "utf8"),
+  );
+  assert.equal(manifest.short_name, "Wasmeld");
+  assert.equal(manifest.start_url, "/");
+  assert.ok((await stat(new URL("../dist/sw.js", import.meta.url))).size > 0);
+});