♻️ refactor: remove duplicated code (Quick Wins)

- Delete unused Input.svelte from Picture app (70 LOC)
- Remove sleep() from shared-api-client, import from shared-utils
- Fix NodeJS.Timeout type for browser compatibility

Part of consolidation effort - see docs/CONSOLIDATION_OPPORTUNITIES.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/shared-api-client/src/client.ts

@@ -11,8 +11,8 @@ import {
 	getErrorCodeFromStatus,
 	isRetryableError,
 	parseErrorResponse,
-	sleep,
 } from './utils';
+import { sleep } from '@manacore/shared-utils';
 
 const DEFAULT_TIMEOUT = 30000;
 const DEFAULT_RETRIES = 0;

packages/shared-api-client/src/utils.ts

@@ -59,13 +59,6 @@ export async function parseErrorResponse(response: Response): Promise<string> {
 	}
 }
 
-/**
- * Sleep utility for retry delays
- */
-export function sleep(ms: number): Promise<void> {
-	return new Promise((resolve) => setTimeout(resolve, ms));
-}
-
 /**
  * Check if error is retryable (network issues, 5xx errors)
  */