fix tsconfig: remove broken extends, add standalone config

tsconfig.json

@@ -1,7 +1,5 @@
 {
-	"extends": "./.svelte-kit/tsconfig.json",
 	"compilerOptions": {
-		"rewriteRelativeImportExtensions": true,
 		"allowJs": true,
 		"checkJs": true,
 		"esModuleInterop": true,
@@ -10,11 +8,13 @@
 		"skipLibCheck": true,
 		"sourceMap": true,
 		"strict": true,
-		"moduleResolution": "bundler"
-	}
-	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
-	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
-	//
-	// To make changes to top-level options such as include and exclude, we recommend extending
-	// the generated config; see https://svelte.dev/docs/kit/configuration#typescript
+		"moduleResolution": "bundler",
+		"module": "esnext",
+		"target": "esnext",
+		"paths": {
+			"$lib": ["./src/lib"],
+			"$lib/*": ["./src/lib/*"]
+		}
+	},
+	"include": ["src/**/*"]
 }