Add Proton Mail/VPN, Secure Notepad, ROS Checks and DarkNet Ops desktop apps

[Rali0s]

Motivation

• Replace the previous generic desktop app registry with a small Proton/ROS-focused workflow for secure operations and monitoring.
• Surface VPN/email safety checks, PII guardrails, DNS/VPN diagnostics and a ROS-OS "DarkNet Ops" use-case as first-class desktop icons.

Description

• Replaced APPS in src/utils/constants.js to expose five new entries: Proton Mail, Proton VPN, Secure Notepad, ROS Checks, and DarkNet Ops (security/operations-focused).
• Updated src/OSDashboard.jsx to import and map the new components into the desktop UI so the new icons open corresponding windows.
• Added five new UI components as placeholders that capture checklist items and safety guardrails: src/components/ProtonMailApp.jsx, src/components/ProtonVPNApp.jsx, src/components/SecureNotepadApp.jsx, src/components/ROSChecksApp.jsx, and src/components/DarkNetOpsApp.jsx.
• The new components are UI-first placeholders (status labels and checklist items) and include notes that live detection/diagnostics will be wired later (Python web interface / DownDetection integration).

Testing

• Started the dev server with npm run dev -- --host 0.0.0.0 --port 4173, and Vite reported ready and served the app (local/network URLs shown), indicating the build runs successfully.
• Attempted an automated browser screenshot with Playwright to verify UI rendering, but the headless Chromium crashed in this environment (SIGSEGV / DBus socket error) so no screenshot was produced.
• No unit or integration tests were added; status indicators in the UI remain placeholders until runtime wiring is implemented.

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Codex Task