perf: fix slow page loads and gate performance in CI

- Ship one hashed Tailwind stylesheet instead of two (one render-blocking)
- Compress responses in-app (brotli/gzip, streaming-safe) and precompress
  the node build so local and CI measurements match production
- Validate the Supabase session once per request
- Render the homepage immediately and stream public stats
- Stream a Pokedex's entries with the page instead of fetching after
  hydration, running the rows and count queries in parallel
- Shrink the avatar and offline placeholder images, fix layout shift,
  contrast, link names and missing meta descriptions
- Add Lighthouse CI (mobile + desktop) with score and metric budgets,
  bundle-size budgets in the build tests, and signed-in speed scenarios

src/routes/pokedex/[id]/+page.server.ts

@@ -1,7 +1,11 @@
 import { error, redirect } from '@sveltejs/kit';
 import PokedexRepository from '$lib/repositories/PokedexRepository';
+import { loadCombinedDataPage } from '$lib/services/CombinedDataService';
 import type { PageServerLoad } from './$types';
 
+// Must match the page's itemsPerPage: the box view needs the whole dex in one page.
+const INITIAL_PAGE_SIZE = 9999;
+
 export const load: PageServerLoad = async ({ locals, params }) => {
 	const { safeGetSession, supabase } = locals;
 	const { session, user } = await safeGetSession();
@@ -22,7 +26,22 @@ export const load: PageServerLoad = async ({ locals, params }) => {
 		throw error(404, 'Pokédex not found');
 	}
 
+	// Streamed rather than awaited: the page shell renders straight away and the entries arrive in
+	// the same response, instead of the browser requesting them after hydration. A failure resolves
+	// to null so the page falls back to fetching (and reporting) through the API.
+	const initialCombinedData = loadCombinedDataPage(supabase, user.id, pokedex, {
+		page: 1,
+		limit: INITIAL_PAGE_SIZE,
+		enableForms: pokedex.isFormDex
+	})
+		.then((result) => result.combinedData)
+		.catch((err) => {
+			console.error('Unable to preload combined data', err);
+			return null;
+		});
+
 	return {
-		pokedex
+		pokedex,
+		initialCombinedData
 	};
 };