Status code 5000 is Checkmate's internal sentinel for "no HTTP response
received" (DNS failure, connection refused, timeout, TLS error, etc.).
Showing the raw number to admins is confusing — the value isn't a real
HTTP code and means nothing without context.
This change replaces "5000" with "Down" across all check/incident
surfaces, and adds a hover tooltip that explains the underlying cause
based on the stored error message. Real HTTP codes (2xx/3xx/4xx/5xx)
are unchanged.
## Changes
- Add client/src/Utils/statusCode.ts with formatStatusCode,
getStatusCodeTooltip, getStatusCodeValueType, extractErrorCode, and a
message-to-subtype parser (timeout / dns / refused / tls / reset).
- Wire into 6 render sites: Checks table, Uptime details Checks table,
GeoChecks table + map popup, Incidents table, Incident details dialog.
- Add common.statusCode.* i18n keys in en.json with subtype-specific
descriptions. Tooltip appends the raw error code (ECONNREFUSED,
ETIMEDOUT, CERT_HAS_EXPIRED, etc.) when present in the message.
## Tooltip examples
- "queryA ECONNREFUSED www.example.com" →
"The server refused the connection (port closed or service not listening). (ECONNREFUSED)"
- "connect ETIMEDOUT 1.2.3.4:443" →
"The server didn't respond in time (request timed out). (ETIMEDOUT)"
## Notes
- No DB or server changes; statusCode field stays 5000 in storage.
- Other locales fall back to English keys until translated.
Alex Holliday
gorkem-bwl