Adds focused tests across multiple modules to push toward the 87% threshold:
- CoreComponents: pagination/1 (multi-page, ellipsis, params),
list/1 (slot rendering), and signal_badge/1 across all RSSI bands.
- ApiDocs/GraphQLDocs controllers: bypass-the-router pattern so the
"scope-with-organization" branches are actually exercised (the public
routes are unscoped, so the org branch is unreachable via get/2).
- Mix.Tasks.Unused: text + JSON output, --only / --skip filters.
- Mix.Tasks.JobCleanupTask: prod path with phoenix snmp enabled vs
disabled (uses :job_cleanup_settle_ms = 0 to avoid the 1s sleep).
- Member resolver: success path for remove/update_role on non-owner
membership, and the changeset-error branch for an invalid role.
- Check resolver: unauthenticated fallback clauses for list / get /
create / update / delete.
- RfLinks: nil-signal sort ordering, :unknown classification for
nil/nil signal+snr, :degraded filter, capacity_utilization edge
cases (max_rate 0/missing, both rates nil).
- StatusHelpers: status_emoji + title_with_status across green / red
branches (warning is unreachable given the active-alerts query).
- ApiTokens: spawn_async_update/2 path with env != :test.
- ImpactAnalysis: to_json/1 across nil and populated levels.
- Maintenance: query helpers (default-arity wrappers, active range)
and Show LiveView delete event redirecting to /maintenance.
- Coverage map: probe_point event handler.
- InvitationQuery: default-arity pending/1.
- REST CRUD at /api/v1/checks for HTTP, TCP, DNS, ping checks
- GraphQL queries (checks, check) and mutations (create/update/delete)
- ping executor using system ping with macOS/Linux parsing
- check config validation for ping type (requires host)
- API documentation updated with checks resource section
Reviewed-on: graham/towerops-web#52
