- Promote DeviceType from Int typealias to a proper enum in BitwardenKit
  with a safe Decodable fallback to .unknownBrowser for unknown values;
  update DefaultHeadersRequestHandler and IdentityTokenRequestModel to
  use .rawValue where an Int is required
- Add DeviceTypeCategory and DeviceType display extensions (category,
  platform, displayName, pendingRequestMatchKey) in BitwardenShared Core
- Add DeviceActivityStatus enum mapping server dates to activity buckets
  using calendar-day comparison
- Add DeviceListItem domain model, DeviceResponse/DevicesListResponse API
  models, CurrentDeviceRequest/DevicesListRequest, and DeviceAPIService
  with getCurrentDevice(appId:) and getDevices() methods
- Add deviceAPIService as a proper init parameter to ServiceContainer
  (consistent with all other services); update withMocks() default to
  MockDeviceAPIService()
- Add tests for all new types and request/response models; add JSON
  fixtures CurrentDevice.json and DevicesList.json

…or backward compat

Tests that configure device API responses via MockHTTPClient (e.g.
LoginProcessorTests) continue to work unchanged. Callers that need
precise mock control pass MockDeviceAPIService explicitly.

- Use the DefaultValue property wrapper for DeviceResponse.type instead
  of a hand-rolled Decodable init, matching the CollectionType/
  CipherRepromptType pattern; add Sendable conformance to DefaultValue
  so it composes with Sendable response models
- Fix DeviceActivityStatus to classify "this month" by actual calendar
  month instead of a fixed 15-30 day range, which mislabeled dates from
  a previous calendar month (e.g. June 20 relative to a July 15 "now")
- Move DeviceListItem's DeviceResponse-based init into an extension so
  the compiler synthesizes the memberwise init instead of hand-writing it
- Rename BitwardenShared DeviceType.swift to DeviceTypeCategory.swift to
  match the DeviceTypeCategory enum it defines
- Add missing coverage: DeviceType/DeviceResponse unknown-value decode
  fallback, and DeviceTypeCategory/DeviceType category-platform-
  displayName-pendingRequestMatchKey mappings

Replace the calendar-month check for the .thisMonth bucket with pure
day-count thresholds (14-29 days), mirroring the Android app's
toLastActivityLabel logic so both platforms show identical "last
active" labels for the same date.