feat: add manifesto page, lazy-load gallery, sitemap lastmod

- New /why manifesto page comparing FTWA to Electron and PWA
- Link to manifesto from "Why FTWA?" homepage section
- Force lazy-loading and async decoding on gallery card images
- Add /sitemap.xml to prerender routes
- Sitemap entries now report lastmod from git log

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mathix420

app/components/WebsiteCard.vue

@@ -77,7 +77,11 @@ onMounted(() => {
       :alt="website.name"
       sizes="588px"
       loading="lazy"
-      :img-attrs="{ class: 'w-full aspect-card-img rounded-lg sm:rounded-xl rounded-b-2xl sm:rounded-b-2xl' }"
+      :img-attrs="{
+        loading: 'lazy',
+        decoding: 'async',
+        class: 'w-full aspect-card-img rounded-lg sm:rounded-xl rounded-b-2xl sm:rounded-b-2xl',
+      }"
     />
   </UCard>
 </template>

app/pages/index.vue

@@ -18,6 +18,17 @@ const { data } = await useAsyncData("app-samples", () => queryContent<VerifiedWe
 
       <AppFeatures />
 
+      <div class="-mt-16 mb-12 flex justify-center">
+        <UButton
+          size="xl"
+          :ui="{ rounded: 'rounded-full' }"
+          variant="outline"
+          label="Read the manifesto"
+          leading-icon="heroicons:newspaper"
+          to="/why"
+        />
+      </div>
+
       <h2
         id="create-web-app"
         class="py-10 text-center font-title text-3xl font-black uppercase sm:text-4xl"