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

package.json

@@ -21,7 +21,8 @@
 		"lint": "prettier --check . && eslint .",
 		"lint-fix": "npm run lint --fix",
 		"format": "prettier --write .",
-		"tailwind": "npx tailwindcss -i ./static/input.css -o ./static/output.css",
+		"tailwind": "npx tailwindcss -i ./static/input.css -o ./static/output.css --minify",
+		"test:lighthouse": "npm run build-inject-manifest-node && lhci autorun",
 		"test:unit": "vitest run tests/unit",
 		"test:data": "vitest run tests/data",
 		"test:coverage": "vitest run tests/unit --coverage",
@@ -46,6 +47,7 @@
 		"dev:supabase": "supabase start && npm run dev"
 	},
 	"devDependencies": {
+		"@lhci/cli": "^0.15.1",
 		"@playwright/test": "1.55.1",
 		"@sveltejs/adapter-auto": "^3.0.0",
 		"@sveltejs/adapter-netlify": "^4.1.0",