refactor(console-web): centralize page lifecycle and UI composition

Declare navigation, page metadata, lazy loaders, and keep-alive policy in one registry. Retain primary iframe pages until a continuous inactive TTL expires and expose typed show, hide, and unload events through the Page SDK.

Move business-aware components out of the UI primitive directory, migrate views and Host dialogs to variant primitives and local Tailwind classes, and remove the global component style layer. Keep native dialogs inside the overlay flex context so they remain centered.

Cover iframe expiration, lifecycle dispatch, UI dependency direction, and global style ownership with focused tests.

crates/wasmeld-console/web/src/pages/main.tsx

@@ -1,21 +1,9 @@
 import { AlertTriangle, LoaderCircle } from "lucide-solid";
-import { lazy, Show, Suspense, type Component } from "solid-js";
+import { lazy, Show, Suspense } from "solid-js";
 import { render } from "solid-js/web";
-import { isView, type View } from "../lib/model";
 import { createFrameBridge } from "../primitives/create-frame-bridge";
 import "../styles/app.css";
-import type { PageProps } from "./types";
-
-// Each view is a dynamic import so a freshly-created iframe evaluates only the
-// page it owns. Destroying that iframe releases the chunk's runtime objects.
-const pages: Record<View, Component<PageProps>> = {
-  overview: lazy(() => import("./overview")),
-  services: lazy(() => import("./services")),
-  instances: lazy(() => import("./instances")),
-  "wit-packages": lazy(() => import("./wit-packages")),
-  activity: lazy(() => import("./activity")),
-  settings: lazy(() => import("./settings")),
-};
+import { isView, pageDefinition } from "./registry";
 
 function FramePage() {
   const requested = new URLSearchParams(window.location.search).get("view");
@@ -36,17 +24,23 @@ function FramePage() {
     >
       {(activeView) => {
         const bridge = createFrameBridge(activeView());
-        const Page = pages[activeView()];
-        document.title = `${activeView()} · Wasmeld`;
+        const definition = pageDefinition(activeView());
+        const Page = lazy(definition.load);
+        document.title = `${definition.label} · Wasmeld`;
         return (
           <Suspense
             fallback={
               <main class="flex min-h-dvh items-center justify-center text-muted">
-                <LoaderCircle class="spin" size={24} />
+                <LoaderCircle class="animate-spin" size={24} />
               </main>
             }
           >
-            <Page state={bridge.state} active={bridge.active} command={bridge.command} />
+            <Page
+              state={bridge.state}
+              active={bridge.active}
+              lifecycle={bridge.lifecycle}
+              command={bridge.command}
+            />
           </Suspense>
         );
       }}