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

tailwind.config.js

@@ -1,9 +1,9 @@
 /** @type {import('tailwindcss').Config} */
 export default {
 	content: [
-		'./src/routes/**/*.{svelte,js,ts}',
-		'./src/routes/**/**/*.{svelte,js,ts}',
-		'./src/lib/components/**/*.{svelte,js,ts}'
+		'./src/**/*.{html,svelte,js,ts}',
+		'./static/offline.html',
+		'./static/offline-viewer.js'
 	],
 	theme: {
 		extend: {}
@@ -16,11 +16,16 @@ export default {
 			'dracula',
 			{
 				pokeball: {
-					primary: '#ee1515',
+					// A slightly deeper Poké Ball red: #ee1515 gave white text only 4.3:1 contrast, below
+					// the WCAG AA 4.5:1 minimum that the Lighthouse accessibility gate checks.
+					primary: '#d31111',
 					'primary-content': '#ffffff',
 					secondary: '#ffd700',
 					'secondary-content': '#ffffff',
 					accent: '#3b82c4',
+					// daisyUI's default info blue is too light for text on the base colours.
+					info: '#0369a1',
+					'info-content': '#ffffff',
 					neutral: '#ffffff',
 					'base-100': '#f0f0f0',
 					'base-content': '#222224'