feat: check sandbox snapshot on login, trigger setup if missing

[sweetmantech]

Summary

• Adds useSetupSandbox hook that runs once after Privy authentication
• Checks GET /api/sandboxes for existing snapshots; if none exist, fires POST /api/sandboxes/setup in the background
• Ensures every user has a GitHub repo + snapshot provisioned before they start using the terminal

Changes

• New: app/hooks/useSetupSandbox.ts — client hook for background sandbox provisioning
• Modified: app/components/TerminalPage.tsx — integrates the hook

Test plan

• Log in with a new account → verify POST /api/sandboxes/setup is called
• Log in with an existing account that has a sandbox → verify setup is NOT called
• Verify no UI changes or error messages appear (silent background provisioning)
• Verify the hook only runs once per login session (refresh should not re-trigger)

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
bash	Ready	Preview	Feb 12, 2026 2:38pm

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch sweetmantech/myc-4217-bash-onlogin-if-missing-github-snapshot-call-post-v2

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