- dispatch_test_notification now resolves tracking_config / template_config
from the tracker's default_* fields when the per-link override is unset,
matching what load_link_data does for the real watcher. Previously
periodic/scheduled/memory tests silently failed with "no template
defined" whenever the user configured the template config at the
tracker level instead of on each link (the UI's normal default).
- Distinguish the two missing-template cases in the returned error
("no template config linked" vs. "slot missing in linked config").
- Frontend testTrackerTarget now treats {success:false,error:"..."} in a
2xx body as a failure — previously any 2xx flashed a success snack so
users never saw the real reason their test didn't deliver.
alexei.dolgolyov
80c034d2af