fix(auth )login success screen

[luanvdw]

Updates the OAuth login success screen with UTF-8 rendering, themed styling, workspace-aware copy, and better callback coverage.

[coderabbitai]

Walkthrough

This PR enhances the Prisma CLI OAuth login flow to display a customized success page. After successful authentication, the callback handler resolves the workspace name from stored tokens via the management API, renders a personalized HTML success page with proper HTML escaping, and returns it with UTF-8 charset metadata. Tests validate charset handling, workspace name resolution, HTML escaping, fallback behavior, and styling. Documentation updates describe the confirmation behavior.

Changes

OAuth Login Success Page with Workspace Resolution

Layer / File(s)	Summary
State Storage Field packages/cli/src/lib/auth/login.ts	LoginState now stores tokenStorage as an instance field, initialized before SDK creation to enable workspace name resolution.
Workspace Name Resolution packages/cli/src/lib/auth/login.ts	LoginState.resolveWorkspaceName() reads tokens from tokenStorage, fetches the workspace record via management API, and returns the workspace name or null on missing tokens or errors.
Success Page Generation packages/cli/src/lib/auth/login.ts	renderSuccessPage(workspaceName) generates workspace-specific or fallback generic success HTML, and escapeHtml(value) prevents HTML injection by escaping the workspace name before embedding.
Callback Handler Orchestration packages/cli/src/lib/auth/login.ts	The /auth/callback handler resolves workspace name, sets Content-Type header with charset=utf-8, and responds with the dynamically rendered success page.
Tests and Validation packages/cli/tests/auth-login.test.ts	Test suite verifies charset and meta tag handling, workspace-specific success copy, HTML escaping, fallback copy, theme CSS inclusion, and logo styling. Helper function requestSuccessPage mocks TokenStorage and management API to simulate the complete callback flow.
Command Specification docs/product/command-spec.md	Updated prisma-cli auth login specification to document that successful browser authentication confirms success and returns control to the terminal.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: fixing/updating the auth login success screen, which is the primary focus across all modified files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description accurately describes the changeset, covering UTF-8 rendering, themed styling, workspace-aware copy, and callback coverage improvements.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/auth-login

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch fix/auth-login

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