feat: add subscription and credit to auth status

[leechenghsiu]

Show plan and credit balance in auth status output and JSON.

DES-530

Description (required)

Related issues & labels (optional)

• Closes #
• Suggested label:

---

^{Need help on this PR? Tag @codesmith with what you need.}

• Let Codesmith autofix CI failures and bot reviews

Summary by CodeRabbit

• New Features
  • The status command now displays enhanced account information, including subscription plan and credit balance (shown in currency), providing a more comprehensive view of your account details.

[coderabbitai]

Walkthrough

The PR enriches user account display by adding subscription and billing fields to the User model (Subscription, Credit, ReferralCode), extends the model's table output methods to include plan and formatted credit columns, and updates the status command's login message to display username, plan, and credit alongside the existing name and email.

Changes

User Account Status Enrichment

Layer / File(s)	Summary
Data Model & Methods pkg/model/user.go	Adds Subscription type with Plan field and extends User struct with Subscription, Credit, and ReferralCode fields. Header() adds Plan and Credit columns; Rows() emits subscription plan and credit formatted as dollars (converted from cents).
Command Wiring internal/cmd/auth/status/status.go	Status command log output now displays username, plan, and formatted credit in addition to existing name and email when logged in and non-JSON output is used.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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.
Title check	✅ Passed	The title accurately captures the main changes: adding subscription and credit fields to the auth status command, which aligns with the core modifications in both the status command and User model.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch matthewlee/des-530-auth-status-fields

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[canyugs]

Consolidated Review Summary

Reviewed by 4 parties (CodeRabbit + 3 internal reviewers + AI agent).

⚠️ Suggested fix before merge

referralCode is in the PR title but not visible in auth status output

The PR title states:

feat: add subscription, credit, and referralCode to auth status

But:

• auth status text output (status.go:57) only shows plan and credit, not referralCode
• auth status -v table (User.Header() / Rows()) only adds Plan/Credit columns, not ReferralCode
• Only auth status --json exposes it (via struct serialization)

Fix (pick one):

1. Add referralCode to the log line and to Header() / Rows() so it shows in both default and -v output
2. Or update the PR title/description to clarify it is a JSON-only field

🟡 Non-blocking suggestions (follow-up OK)

• Money in float64: float64(u.Credit)/100 works but loses precision for large values. Prefer integer arithmetic: fmt.Sprintf("$%d.%02d", u.Credit/100, u.Credit%100).
• Subscription as value type: when the API returns null (no subscription), output becomes plan: (empty). Consider *Subscription or fall back to Free/N/A.
• Negative credit display: edge case $-0.50 reads awkwardly — minor.
• Unit tests for the cents→dollars formatting and zero/negative cases.

🟢 Already correct

• GraphQL field tags align with schema
• Struct field re-alignment is clean
• USD assumption is correct (Zeabur platform is USD-only)

LGTM after the referralCode decision.

[leechenghsiu]

Fixed PR title — removed referralCode mention. The field is still included in JSON output via the User model but doesn't need to be in the text output.