Files
Checkmate/client
gorkem-bwl 602769b3e7 feat(checks): render status code 5000 as "Down" with subtype tooltip
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.
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This directory contains the client side (frontend) of Checkmate.