Remove unused code parameter from describePreviewError

[kridaydave]

describePreviewError took a code argument that was never used because lookups key on the description string. Dropped the parameter, updated the only caller in PreviewUnreachable, and added a unit test covering the mapped, unknown, and empty-description cases.

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Note

Low Risk
Small API cleanup in preview error copy with one call site; only user-visible change is dropping the code from the empty-description fallback string.

Overview
Removes the unused numeric code argument from describePreviewError, since friendly labels are keyed only on the Chromium description string. PreviewUnreachable now passes description alone.

When description is empty, the fallback user-facing text changes from Network error (${code}) to Network error. Numeric codes still appear in the UI via errorLabel when description is empty.

Adds errorCodeMessages.test.ts for known error mapping, unknown passthrough, and the empty-description fallback.

^{Reviewed by Cursor Bugbot for commit fcbc174. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Remove unused code parameter from describePreviewError

Removes the numeric code argument from describePreviewError in errorCodeMessages.ts and updates the call site in PreviewUnreachable.tsx to match. The fallback message for an empty description changes from 'Network error (code)' to 'Network error'. Unit tests covering known Chromium error mapping, unknown description passthrough, and the empty fallback are added in errorCodeMessages.test.ts.

^{Macroscope summarized fcbc174.}

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Approvability

Verdict: Approved

Removes an unused code parameter from describePreviewError and adds unit tests. The only behavioral change is a minor simplification of a fallback error message. Low-risk cleanup.

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