fix: omit inferred credit usage above plan allowance

[developersdigest]

When the remaining credit balance exceeds the plan allowance, firecrawl credit-usage subtracts the balance from the allowance and reports negative usage and a negative percentage.

Keep showing the remaining balance and plan allowance, and omit the inferred usage line in that case. The API response does not provide enough information to calculate actual usage from those two values. Balances at or below the allowance retain the existing display; JSON output is unchanged.

Validation: TypeScript build, formatting check, and the credit-usage test file pass (17 tests). A focused rendering regression covers balances above, equal to, and below the allowance.

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Summary by cubic

Fixes firecrawl credit-usage reporting negative usage when the remaining credit balance exceeds the plan allowance. The command now omits the inferred used-credits line in that case, since the API response doesn't provide enough data to compute actual usage; balances at or below the allowance keep the existing display, and JSON output is unchanged.

^{Written for commit 65af5e3. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Heads up: you’re close to your flex budget. Increase your flex budget so reviews don’t pause.

Shadow auto-approve: would auto-approve. Fixes negative inferred credit usage by omitting that line when the remaining balance exceeds the plan allowance. The focused rendering tests cover above, equal, and below allowance cases while preserving existing valid displays.

Re-trigger cubic</sub>