feat: bootstrap foundation application

apps/web/src/app.tsx

@@ -0,0 +1,31 @@
+export function App() {
+  return (
+    <main class="shell">
+      <section class="hero">
+        <p class="eyebrow">MD Hub Secure</p>
+        <h1>Preact foundation for future hydrated features</h1>
+        <p class="lede">
+          The Go server is the source of truth for rendering document pages.
+          This app is the scaffold for search, sync, comments, and design
+          tooling that will hydrate over time.
+        </p>
+      </section>
+
+      <section class="grid">
+        <article class="card">
+          <h2>Current scope</h2>
+          <p>
+            Routing, bundling, TypeScript, and styles are in place for later
+            feature islands.
+          </p>
+        </article>
+        <article class="card">
+          <h2>Next milestone</h2>
+          <p>
+            Sync protocol UI, offline cache status, and browser-side search.
+          </p>
+        </article>
+      </section>
+    </main>
+  );
+}

apps/web/src/main.tsx

@@ -0,0 +1,11 @@
+import { render } from "preact";
+import { LocationProvider, Route, Router } from "preact-iso";
+import { App } from "./app";
+import "./styles.css";
+
+render(
+  <LocationProvider>
+    <Router>{[<Route path="/*" component={App} />]}</Router>
+  </LocationProvider>,
+  document.getElementById("app")!,
+);

apps/web/src/styles.css

@@ -0,0 +1,91 @@
+:root {
+  color-scheme: light;
+  --bg: #f4f1ea;
+  --surface: rgba(255, 255, 255, 0.78);
+  --surface-strong: #ffffff;
+  --text: #202227;
+  --muted: #5f6471;
+  --accent: #1947e5;
+  --accent-2: #0f8a6c;
+  --border: rgba(32, 34, 39, 0.12);
+  --shadow: 0 20px 60px rgba(25, 71, 229, 0.12);
+  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  min-height: 100vh;
+  color: var(--text);
+  background:
+    radial-gradient(
+      circle at top left,
+      rgba(25, 71, 229, 0.16),
+      transparent 36%
+    ),
+    radial-gradient(
+      circle at bottom right,
+      rgba(15, 138, 108, 0.18),
+      transparent 30%
+    ),
+    linear-gradient(180deg, #faf7f2 0%, var(--bg) 100%);
+}
+
+.shell {
+  max-width: 960px;
+  margin: 0 auto;
+  padding: 4rem 1.5rem 5rem;
+}
+
+.hero {
+  padding: 2rem;
+  border: 1px solid var(--border);
+  border-radius: 28px;
+  background: var(--surface);
+  backdrop-filter: blur(10px);
+  box-shadow: var(--shadow);
+}
+
+.eyebrow {
+  margin: 0 0 0.75rem;
+  color: var(--accent);
+  font-family: ui-monospace, SFMono-Regular, monospace;
+  font-size: 0.82rem;
+  letter-spacing: 0.18em;
+  text-transform: uppercase;
+}
+
+.hero h1 {
+  margin: 0;
+  font-size: clamp(2.25rem, 5vw, 4rem);
+  line-height: 0.95;
+}
+
+.lede {
+  max-width: 42rem;
+  margin: 1.5rem 0 0;
+  font-size: 1.1rem;
+  line-height: 1.7;
+  color: var(--muted);
+}
+
+.grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
+  gap: 1rem;
+  margin-top: 1.5rem;
+}
+
+.card {
+  padding: 1.25rem;
+  border: 1px solid var(--border);
+  border-radius: 20px;
+  background: var(--surface-strong);
+}
+
+.card h2 {
+  margin-top: 0;
+}