feat!: upgrade to SvelteKit 3 and adapter-bun

- run sv migrate sveltekit-3: config moves into vite.config.ts, $lib becomes
  #lib, $env/dynamic becomes $app/env/private via src/env.ts, $app/environment
  becomes $app/env, hook types move to @sveltejs/kit/hooks
- env vars stay optional (the migrator defaulted them to ''), and BANCHO_MODE,
  which it missed, is declared and passed to simulatorEnabled
- handleError only logs and masks unknown errors; Kit 3 now routes 404s and
  error(...) through it too
- json()/text() become Response.json()/new Response(); goto keepFocus/noScroll
  becomes reset: false; invalidateAll becomes refreshAll; page.url is copied
  before mutating
- replace adapter-node with @sveltejs/adapter-bun; prod-server.ts wraps
  Bun.serve to add native WebSockets (bunSockets) for /ws paths, since the
  generated server has no websocket option
- drop the Kit readdir patch: Kit 3 sorts route entries itself
- match view and broadcast pages use the live score modules

BREAKING CHANGE: requires SvelteKit 3, TypeScript 6 and Bun 1.4; the build
output is build/index.js from adapter-bun, started through prod-server.ts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package.json

@@ -18,6 +18,7 @@
 		"test:e2e": "playwright test",
 		"test:streamer": "bun test streamer/",
 		"streamer": "bun streamer/agent.ts",
+		"broadcast:build": "bun build streamer/windows/cli.ts --compile --minify --target=bun-windows-x64 --outfile dist/vash-broadcast.exe",
 		"streamer:build": "bun build streamer/agent.ts --compile --minify --target=bun-windows-x64 --outfile dist/vash-streamer.exe && bun build streamer/agent.ts --compile --minify --target=bun-linux-x64 --outfile dist/vash-streamer",
 		"db:seed": "bun scripts/seed-dev.ts",
 		"db:push": "drizzle-kit push",
@@ -34,8 +35,9 @@
 		"@lucide/svelte": "^1.48.0",
 		"@playwright/test": "^1.63.0",
 		"@sentry/sveltekit": "^10.75.3",
-		"@sveltejs/adapter-node": "^5.5.7",
-		"@sveltejs/kit": "^2.70.3",
+		"@sveltejs/adapter-bun": "^1.0.0",
+		"@sveltejs/kit": "^3.0.0",
+		"@sveltejs/load-config": "^0.2.2",
 		"@sveltejs/vite-plugin-svelte": "^7.3.1",
 		"@tailwindcss/typography": "^0.5.20",
 		"@tailwindcss/vite": "^4.3.3",
@@ -68,7 +70,7 @@
 		"tailwind-variants": "^3.3.1",
 		"tailwindcss": "^4.3.3",
 		"tw-animate-css": "^1.4.0",
-		"typescript": "~5.8.3",
+		"typescript": "^6.0.0",
 		"typescript-eslint": "^8.70.1",
 		"vite": "^8.3.1",
 		"vite-plugin-devtools-json": "^1.1.0",
@@ -88,7 +90,8 @@
 		"discord.js": "^14.27.0",
 		"zod": "^4.6.5"
 	},
-	"patchedDependencies": {
-		"@sveltejs/kit@2.70.3": "patches/@sveltejs%2Fkit@2.70.3.patch"
+	"imports": {
+		"#lib": "./src/lib/index.js",
+		"#lib/*": "./src/lib/*"
 	}
 }