feat: add Next.js 16 frontend for Secure App

[SX110903]

This PR introduces a Next.js 16 frontend for the Secure App and resolves environment-specific integration issues.

Problem/Issue/Goal:

• Need for a modern, secure frontend framework to replace or augment the existing interface
• Integration conflicts between the Next.js directory structure and the existing PHP project environment

Fix/Solution:

• Implemented a new frontend architecture using Next.js 16
• Resolved directory discovery issues to ensure compatibility within the PHP project structure

Chat link: https://v0.app/chat/G0fL0JaJ1cf

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Project	Deployment	Actions	Updated (UTC)
php-project-web	Error		Feb 10, 2026 7:28pm

[Copilot]

Pull request overview

Adds a Next.js 16 frontend configuration to the Secure App repo and introduces a small diagnostics script intended to help debug directory discovery/integration issues when colocated with the existing PHP project.

Changes:

• Added a Node diagnostics script to print cwd and directory contents for troubleshooting.
• Updated next.config.ts to use TypeScript typing (NextConfig) instead of JSDoc typing.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
scripts/check-dirs.mjs	New diagnostics script that inspects working directory and app/ presence/contents.
next.config.ts	Converts config typing to TypeScript import/type annotation.

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[Copilot]

statSync() can throw (e.g., permission issues or a race where the path disappears between existsSync and statSync). Consider storing the resolved path once and wrapping the statSync call in a try/catch (or use a single try { ... } block) so this diagnostic script doesn’t fail unexpectedly.

Suggested change

	console.log("[v0] Current working directory:", cwd);
	console.log("[v0] app dir exists:", existsSync(resolve(cwd, 'app')));
	console.log("[v0] app is directory:", existsSync(resolve(cwd, 'app')) && statSync(resolve(cwd, 'app')).isDirectory());
	if (existsSync(resolve(cwd, 'app'))) {
	console.log("[v0] app dir contents:", readdirSync(resolve(cwd, 'app')));
	}
	const appDir = resolve(cwd, 'app');
	const appDirExists = existsSync(appDir);
	console.log("[v0] Current working directory:", cwd);
	console.log("[v0] app dir exists:", appDirExists);
	let appIsDirectory = false;
	if (appDirExists) {
	try {
	appIsDirectory = statSync(appDir).isDirectory();
	} catch (err) {
	console.error("[v0] Error checking if app is directory:", err);
	}
	}
	console.log("[v0] app is directory:", appIsDirectory);
	if (appDirExists) {
	console.log("[v0] app dir contents:", readdirSync(appDir));
	}

[Copilot]

readdirSync() can throw (missing permissions, transient filesystem issues). Since this appears to be a diagnostics script, it would be more robust to catch and log errors instead of crashing, especially if it’s ever run in CI.