## Summary
Migrate the notification category list and the category/action editors
to SwiftUI:
- `NotificationCategoryListView`: local insert/delete, Realm-observed
server categories section, navigation to editor.
- `NotificationCategoryEditorView`: required fields, server-controlled
read-only mode, hidden preview/summary text areas, reorder/insert/delete
action rows, YAML service-call preview, toolbar help,
preview-notification action.
- `NotificationActionEditorView`: required title/identifier, conditional
text-input fields, foreground/destructive/authentication toggles,
server-controlled read-only mode, YAML trigger preview.
Also adds three reusable components:
- `YamlPreviewSection` — replaces Eureka `YamlSection` within this
slice; generalises the inline version previously in `NFCTagView`.
- `NotificationIdentifierField` — SwiftUI text-field helper enforcing
identifier casing/validation (replaces
`NotificationIdentifierEurekaRow`).
- `RealmResultsObserver` — `ObservableObject` wrapping
`AnyRealmCollection` with a notification token (reusable by future
slices).
Deletes the three old `*Configurator.swift` / `*ViewController.swift`
files plus `NotificationIdentifierEurekaRow.swift`.
## Screenshots
_Pending — to be added before merge._
## Link to pull request in Documentation repository
Documentation: home-assistant/companion.home-assistant#
## Any other notes
Part of a five-PR Eureka → SwiftUI migration tracked in
`UIKitToSwiftUIMigration.md` (siblings: #4560, #4561, #4562, #4564). The
`Eureka`, `ColorPickerRow`, and `ViewRow` pods stay until all slices
land.
**Reconciliation with #4562:** this PR embeds
`NotificationCategoryListView` inside the old
`NotificationSettingsViewController` via `UIHostingController` so the
list is reachable while the parent screen is still Eureka. Once #4562
merges, `NotificationSettingsView` should link directly to
`NotificationCategoryListView` — the hosting-controller wrapper becomes
unnecessary.
`YamlSection.swift` and `RealmSection.swift` are retained — still used
by `ActionConfigurator`, `NFCTagViewController`,
`SettingsDetailViewController`, and `ComplicationListViewController`.
`bundle exec fastlane lint` passes. Not build-verified locally yet.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
