chore: remove dead legacy error-string mappings in form-error.ts

[detail-app]

Issue for this PR

Closes #

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Removes 22 lines of dead code from packages/console/app/src/lib/form-error.ts:

1. Sixteen string-literal entries in the map object (e.g. "Invalid plan", "Workspace ID is required", "Email is required", "Model is required") that mapped pre-i18n raw error strings to i18n keys. No code in the monorepo produces any of these raw strings anymore — they were superseded by formError.* keys during the i18n migration, so the lookups were unreachable.
2. Two regex branches in localizeError matching /^Reload amount must be at least \$(\d+)$/ and /^Balance trigger must be at least \$(\d+)$/. The producers of those strings were replaced by formErrorReloadAmountMin/formErrorReloadTriggerMin (which emit the error.reloadAmountMin:<amount> prefix format handled by the earlier startsWith branches), so the regex branches were unreachable.

The payment-related map entries ("workspace.reload.error.paymentFailed", "Payment failed", "Payment failed.") are kept — billing.ts and stripe/webhook.ts still feed those strings into localizeError via the reloadError DB column.

How did you verify your code works?

• Ran npx tsgo --noEmit in packages/console/app — passes with no errors.
• Confirmed via repo-wide grep that no producer of the removed raw strings or regex-matched patterns exists in the monorepo.
• All live exports (formError, formErrorReloadAmountMin, formErrorReloadTriggerMin, localizeError) are unchanged and still resolve to their 11+ production callers.

Screenshots / recordings

N/A — no UI change.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

History

• Last materially changed February 2026 (feat(web): i18n anomalyco/opencode#12471 @adamdotdevin)

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