build: tsconfig noEmit for diigo-cache and webapp

wrangler bundles; tsc only checks. Without noEmit a bare `tsc` wrote
compiled .js beside the sources (a stray webapp/src/index.js).

Generated-by: Claude Opus 5.5

diigo-cache/tsconfig.json

@@ -7,6 +7,7 @@
 		"esModuleInterop": true,
 		"verbatimModuleSyntax": true,
 		"skipLibCheck": true,
+		"noEmit": true,
 		"types": []
 	},
 	"include": ["src/**/*", "worker-configuration.d.ts"]