PhotosPickerItem/PhotosPicker live in the _PhotosUI_SwiftUI overlay module,
visible only when BOTH PhotosUI and SwiftUI are imported in the same file —
the app's sole compile error on the first real Xcode build.
Per-session parked notes mirroring the Android B-M4d feature:
- HapiProtocol Models/ScratchlistApi.swift: wire types for entries CRUD
(idempotent create via client entryId+createdAt), attachment metadata,
limits (defaults from shared/src/scratchlistAttachments.ts), upload
envelope, and the typed error codes (scratchlist_at_cap,
scratchlist_attachment_too_large, scratchlist_attachment_in_use, ...).
- Endpoints/ScratchlistEndpoints.swift: GET/POST/PUT/DELETE entries,
limits, base64 upload, raw-bytes attachment fetch, attachment delete.
- Stores/ScratchlistStore.swift: @MainActor @Observable per-session cache
behind the SessionScratchlistStoring seam - open/release observation,
16 ms-coalesced refetch on the scratchlistUpdatedAt SSE signal,
optimistic create/update/delete with surgical entryId reconcile +
rollback (refresh preserves in-flight optimistic creates), 200-entry cap
pre-check + hub 409 verdict, uploadsInFlight, cached limits with
offline defaults, UTF-16 text clamp at 10000.
- Stores/ScratchlistAttachmentGuard.swift: pure Fits/Downscale/Reject
budget verdicts ported verbatim.
- SessionListStore: onScratchlistInvalidation callback fired when a
session patch carries scratchlistUpdatedAt (the seam the M4b comment
reserved); HubSession wires it into the store and injects the store
into ChatInteractor.
- ChatInteractor (additive tail section): scratchlist store property,
scratchlistCount badge seam, insertComposerText, parkComposerDraft
(composer clears only after the hub accepts; at-cap/failed keep the
draft).
- Features/Scratchlist/: sheet off the chat toolbar's note icon with
count badge - entry cards (4-line preview, relative age, authed
thumbnails via NSCache loader, filename chips), edit sheet
(PhotosPicker -> guard -> JPEG downscale -> upload spinner tile,
remove, delete/save), full-screen viewer (GeneratedImage pattern),
per-entry To composer, and Park current draft in the screen header (a
deliberate placement divergence from Android's composer button - the
composer UI is owned by the concurrent attachments package). iOS-only
import step transcodes disallowed-but-decodable rasters (HEIC) to JPEG
before the guard.
- Tests (36, all transcribed from or mirroring the Android suites): store
CRUD optimistic/rollback/at-cap/invalidation/upload/limits with
canonical wire-body asserts + the SessionListStore seam test, 9 guard
verdicts, 9 interactor park/insert/badge seam tests over a fake store.
Verified on Linux via a dockerized Swift 6.0 scratch copy (FIFO HTTP
performer): full HapiClient build under strict concurrency, 36/36 new
tests green, SessionListStore 17/17 and ChatInteractor 29/29 suites
green; app-side screen model + loader typechecked against stub
frameworks; SwiftUI views and the CG-based import parse-checked (macOS
CI compiles them).
weishu