Fix public auth portal redirects for sign-in/up

[Huynhthuongg]

Summary by cubic

Fixes sign-in/up redirects when Clerk is unavailable by adding a public-only router and /auth portal. Also adds a configurable auth mode and a /health-config page to verify environment setup.

• Bug Fixes

  • In public mode, redirect /sign-in and /sign-up to /auth; block /chat* and /pricing.
  • Replace the missing Clerk key error with a safe public router (PublicAppWithoutAuth).

• New Features

  • Configurable auth via VITE_AUTH_MODE with auth-mode.ts (authMode, isAuthEnabled, clerkConfig) and a /health-config diagnostics page.
  • Added /auth portal and sandbox pages: /mobile-dashboard, /chat-static, /termux-lab, /tools (includes recent tweaks to the Termux mock).
  • Minor TS fixes in chat components and an updated, cleaner tsconfig.json.

^{Written for commit d88d3d7. Summary will update on new commits. Review in cubic}

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[Huynhthuongg]

• @Huynhthuongg @anthropic-code-agent @openai-code-agent

[cubic-dev-ai]

4 issues found across 12 files

Confidence score: 2/5

• There is a high-risk auth behavior in artifacts/sandbox-ai/src/App.tsx: !isAuthEnabled can treat missing Clerk configuration as intentional public mode, which may fail open and expose public routes when auth is actually broken.
• Accessibility regressions in artifacts/sandbox-ai/src/pages/mobile-dashboard.tsx (icon-only button missing aria-label) and artifacts/sandbox-ai/src/pages/termux-lab.tsx (input missing accessible label/name) are concrete user-facing issues with high confidence.
• The artifacts/sandbox-ai/tsconfig.json project-reference note looks lower severity, but it can still cause workspace resolution/build behavior drift if changed incorrectly.
• Pay close attention to artifacts/sandbox-ai/src/App.tsx, artifacts/sandbox-ai/src/pages/mobile-dashboard.tsx, artifacts/sandbox-ai/src/pages/termux-lab.tsx, artifacts/sandbox-ai/tsconfig.json - auth fail-open risk is the main blocker, with accessibility and workspace-config fixes needed before merge.

<sub>Reply with feedback, questions, or to request a fix.

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[cubic-dev-ai]

0 issues found across 2 files (changes from recent commits).

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