chore(web-player): add prettier and eslint

Flat ESLint config with typescript-eslint and eslint-plugin-svelte,
Prettier with the svelte and tailwindcss plugins. Adds the format and
lint scripts.

Three rules are off on purpose: no-navigation-without-resolve (the app
is served at the root, there is no base path), prefer-svelte-reactivity
(the Set and URLSearchParams uses are local computations, not reactive
state) and no-unused-expressions in .svelte only, where reading a rune
on its own line is how an $effect registers a dependency.

web-player/package.json

@@ -0,0 +1,45 @@
+{
+	"name": "web-player",
+	"private": true,
+	"version": "0.0.1",
+	"type": "module",
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"preview": "vite preview",
+		"prepare": "svelte-kit sync || echo ''",
+		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+		"gen:api": "npx -y openapi-typescript@7 http://localhost:5111/openapi/v1.json -o src/lib/api/schema.d.ts",
+		"format": "prettier --write .",
+		"lint": "prettier --check . && eslint ."
+	},
+	"devDependencies": {
+		"@eslint/js": "^10.0.1",
+		"@sveltejs/kit": "^2.63.0",
+		"@sveltejs/vite-plugin-svelte": "^7.1.2",
+		"@tailwindcss/vite": "^4.3.0",
+		"@types/node": "^22.20.1",
+		"eslint": "^10.7.0",
+		"eslint-config-prettier": "^10.1.8",
+		"eslint-plugin-svelte": "^3.21.0",
+		"globals": "^17.7.0",
+		"prettier": "^3.9.5",
+		"prettier-plugin-svelte": "^4.1.1",
+		"prettier-plugin-tailwindcss": "^0.8.1",
+		"svelte": "^5.56.1",
+		"svelte-check": "^4.6.0",
+		"tailwindcss": "^4.3.0",
+		"typescript": "^6.0.3",
+		"typescript-eslint": "^8.64.0",
+		"vite": "^8.0.16"
+	},
+	"dependencies": {
+		"@fontsource-variable/inter": "^5.2.8",
+		"@lucide/svelte": "^1.23.0",
+		"@sveltejs/adapter-node": "^5.5.7",
+		"jose": "^6.2.3",
+		"openapi-fetch": "^0.17.0",
+		"openid-client": "^6.8.4"
+	}
+}