Allow negative auto-topup thresholds

[charlietlamb]

Summary

• allow negative auto-topup thresholds in the shared API schema
• remove the matching customer and plan UI validation
• cover negative thresholds with a schema regression test

Validation

• bun test shared/models/cusModels/billingControls/customerBillingControls.test.ts
• bunx tsgo --build --noEmit (server)
• bunx biome check on changed files
• React Doctor changed-file scan: no issues

---

Summary by cubic

Allow negative auto-topup thresholds across the API and UI. The shared AutoTopupSchema now accepts negative threshold values, UI checks in BillingAutoTopupSheet and the plan billing form no longer block negatives, and a regression test verifies the behavior.

^{Written for commit 4987187. Summary will update on new commits.}

Greptile Summary

This PR allows auto-top-up thresholds below zero. The main changes are:

• API changes · Improvements: Remove the nonnegative constraint from the shared threshold schema.
• Improvements: Accept negative thresholds in customer and plan forms.
• Bug fixes: Add a schema test for a negative threshold.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.
• The shared schema and both UI paths consistently accept negative thresholds.
• Existing balance comparison behavior supports the new threshold range.

Important Files Changed

Filename	Overview
shared/models/cusModels/billingControls/customerBillingControls.ts	Removes the minimum-zero constraint from the shared auto-top-up threshold schema.
shared/models/cusModels/billingControls/customerBillingControls.test.ts	Adds a test confirming that the schema accepts a negative threshold.
vite/src/views/customers2/components/sheets/BillingAutoTopupSheet.tsx	Removes customer-form validation that rejected negative thresholds.
vite/src/views/products/plan/components/edit-plan-details/usePlanBillingControlForm.ts	Updates plan-form validation to allow negative numeric thresholds.

_{Reviews (1): Last reviewed commit: "fix(billing): allow negative auto-topup ..." | Re-trigger Greptile}

Context used:

• Context used - When generating the key changes section of the sum... (source)

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
checkout	Ignored		Jul 22, 2026 2:46pm
landing-page	Ignored		Jul 22, 2026 2:46pm

[cubic-dev-ai]

No issues found across 4 files

Confidence score: 5/5

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

_{Re-trigger cubic}