feat: add Test tab to sidebar with Coming Soon screen

[arul28]

Summary

• Added a new Test tab to the desktop app sidebar (/test route)
• Created a TestPage component that displays a Coming Soon screen
• Wired up the Flask icon, nav item, route, and AppShell tint map entry

Changes

• TabNav.tsx — Flask icon import + /test nav item in mainItems
• App.tsx — lazy TestPage import + /test React Router route
• AppShell.tsx — "/test": "tab-tint-missions" tint map entry
• apps/desktop/src/renderer/components/test/TestPage.tsx — new page with "Coming Soon" message

[coderabbitai]

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Free

Run ID: 5d7b9158-fc46-4870-87aa-3d67cddc844d

📥 Commits

Reviewing files that changed from the base of the PR and between c0dbcb2 and 5044e5e.

📒 Files selected for processing (4)

• apps/desktop/src/renderer/components/app/App.tsx
• apps/desktop/src/renderer/components/app/AppShell.tsx
• apps/desktop/src/renderer/components/app/TabNav.tsx
• apps/desktop/src/renderer/components/test/TestPage.tsx

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📝 Walkthrough

Walkthrough

The changes introduce a new test page feature by adding a lazy-loaded TestPage component, registering a /test route with tint styling, and adding a corresponding navigation menu item with a Flask icon.

Changes

Cohort / File(s)	Summary
Route Registration & Navigation apps/desktop/src/renderer/components/app/App.tsx, apps/desktop/src/renderer/components/app/AppShell.tsx, apps/desktop/src/renderer/components/app/TabNav.tsx	Adds new /test route with lazy-loaded TestPage component, tint mapping aligned with /missions styling, and Flask-icon navigation item to access the test page.
Test Page Component apps/desktop/src/renderer/components/test/TestPage.tsx	New React component that renders a centered "Coming Soon" placeholder with static subtitle text.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

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