fixture(demo/admin): implement admin panel component calling getUser in demo app

[waleedcodes]

📌 Pull Request #55 of 58: AdminPanel.tsx

📂 File & Architectural Context

• Target File: examples/demo-app/src/components/AdminPanel.tsx
• Architectural Layer: Demo App Fixture (UI Components Layer)
• Scope Identifier: demo/admin

🎯 Overview & Motivation

Implements renderAdminPanel calling getUser, serving as an untested downstream caller.

🔍 Detailed Delta & Technical Implementation

• Implemented renderAdminPanel(adminId).
• Calls getUser(adminId).
• Lacks automated test coverage, triggering untested caller warning.

🛡️ Quality Gates & Verification

• Target Base Branch: working
• TypeScript Type Safety: 0 errors (tsc --noEmit).
• Code Quality: 0 ESLint warnings (eslint src --ext .ts).
• Test Suite: 34 / 34 passing tests across 13 test suites (vitest run).
• Production Bundle: Bundled in <700ms with esbuild.
• Verification Details: Verified as untested caller in impact analysis.

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