Drill-down tabs inherit the parent's Kind rather than the semantic
entity Kind. Checks like tab.Kind == tabDocuments silently break
parity; go through Tab.isDocumentTab() or the handler's FormKind()
instead. Refresh the verified date.

promptHardDelete and the confirm-prompt dispatch keyed on tab.Kind, so
Shift+D did nothing in the Appliances > Maintenance drill-down (whose
Kind is tabAppliances, inherited from the parent). The same bug affected
the "Permanently delete this item/incident?" label and the soft-delete
status messages.

Route all entity-semantic checks through handlerFormKind(tab), a new
helper that reads tab.Handler.FormKind() and maps cleanly onto
formIncident, formMaintenance, etc. This keeps drill-downs functionally
identical to their parent tabs.

toggleSettledFilter gets the same treatment: drop the blanket
m.inDetail() early-return and gate on FormKind == formProject via
m.effectiveTab() so any future project-scoped drill-down inherits the
filter automatically.

Reproduction

1. Open a house with at least one appliance.
2. Add a maintenance item scoped to that appliance.
3. Drill into Appliances > Maintenance, press i, then d to soft-delete,
   then Shift+D and y.
4. Before: prompt said "incident", and Yes hard-deleted an incident
   (no-op because no IDs matched), leaving the maintenance item intact.
   After: prompt says "item", and Yes permanently deletes the item.

Pressing "a" in Appliance > Maintenance, Project > Quotes, and
Vendor > Quotes used to open the generic add form and default the
parent field to whichever row happened to sort first in its list.
Users had to re-select the entity they just drilled into.

Carry the drill-down context into the add form via a scoped
startAddFn on each handler, backed by new startMaintenanceFormScoped
and startQuoteFormScoped helpers that pre-populate the known parent
when called with a non-empty ID/name.

Reproduction

1. Create two appliances, Decoy and Parent.
2. Drill into Parent > Maintenance.
3. Press i, then a.
4. Before: form's Appliance select defaults to Decoy. After: it
   defaults to Parent.