Saved Devices UI handoff

This document coordinates the platform UI work built on the production Saved Devices and Targeted Transfer core.

Branch topology

Branch	Ownership	Pull-request base
`feat/device-history`	Shared core contract and integration base	`master` only when the complete feature is ready
`feat/device-history-kmp`	Android, Windows, and Linux Compose UI	`feat/device-history`
`feat/device-history-apple`	Native iOS and macOS SwiftUI	`feat/device-history`

Create both platform branches from the same feat/device-history commit. Keep platform work on its matching branch. Open every platform PR against feat/device-history, never master or the sibling platform branch. When the base advances, merge or rebase feat/device-history into the platform branch; do not merge one platform branch into the other.

Product contract

Saved Device is a top-level product feature, not an experimental setting.
A populated Saved Devices screen has a title-only header. Explanatory copy belongs in the first-use empty state or next to the control that needs it.
The main screen lists saved devices and outstanding consent requests. It does not expose the global Targeted Transfer history.
Selecting a saved device opens a platform-native details surface: bottom sheet on compact mobile layouts and a native inspector, sheet, or dialog on wider layouts. That surface owns Send, label/forget/block actions, and the device's Targeted Transfers with related lifecycle activity, status, progress, and available actions.
Display localLabel when present, otherwise the authenticated remoteDisplayName. Keep the endpoint ID secondary and diagnostic.
Use each platform's native device iconography and interaction conventions. Equivalent behavior may use separate Apple and Compose implementations.
Label changes are transactional from the UI's perspective: preserve the draft and editor on failure, prevent conflicting dismissal/edit actions while saving, and close only after success.
Invitation Transfer and Targeted Transfer source composition have file, folder, editable-name, replacement, and cleanup parity. Keep the domains distinct after creation.
Every Targeted Transfer still needs receiver approval. Saving a device never grants automatic receipt.
UI and platform code manage pickers and destinations; Rust streams payload bytes. Android folder selection expands SAF trees into file descriptors and relative names, never a directory descriptor.

Use the exact domain terms in CONTEXT.md and the security and lifecycle invariants in crates/vnidrop/CORE_FLOW.md. The KMP implementation under shared/src/commonMain/kotlin/com/vnidrop/app/feature/saveddevices/ is a tested behavioral reference, not an Apple visual specification.

KMP implementation branch

Start on feat/device-history-kmp and follow shared/AGENTS.md plus .codex/skills/compose-skill/SKILL.md.

The branch owns:

shared/, androidApp/, and desktopApp/ Saved Devices presentation work;
Material Android and native-feeling Windows/Linux presentations;
per-device details, transfer composition, offers, pairing consent, label editing, and lifecycle actions;
common state-machine tests, JVM Compose interaction tests, and platform adapter tests.

Before handoff, run make check-localization, make check-shared, and the relevant Android build. Inspect the actual Android emulator and desktop window; record any host that could not be rendered.

Apple implementation branch

Start on feat/device-history-apple. Apple remains native SwiftUI; do not add Apple presentation to shared/.

The branch owns:

a top-level Saved Devices destination in the iOS tab bar and macOS sidebar;
an Apple-native Saved Devices model/coordinator and SwiftUI screen;
pairing consent and Targeted Offer presentation outside Experimental Settings;
per-device details and Targeted Transfer lifecycle actions;
iOS/macOS picker and receive-destination integration using the existing platform services;
Swift model tests, UI contract tests, and simulator-rendered visual checks.

Use the generated production UniFFI surface in apple/VnidropCore/Sources/VnidropCore/Vnidrop.swift, including listSavedDevices, listDeviceRelationships, listPairingEligibilities, listPendingTargetedOffers, createTargetedTransfer, respondToTargetedOffer, listTargetedTransfers, receive/resume/cancel/delete, label, forget, and block operations. Wrap those calls through the existing Apple CoreGateway / CoreRepository boundary rather than invoking generated bindings from SwiftUI views.

Use SF Symbols and native iOS/macOS controls even when that duplicates Compose presentation code. Share behavior and vocabulary across platforms, not widget implementations. Before handoff, run make check-localization and make check-apple, then inspect the affected iOS and macOS states in real simulator/app hosts.

Completion gate

Each platform PR is ready only when it demonstrates:

mutual consent creates and names a Saved Device correctly;
an already-saved pair is not prompted to save again;
files and folders can be composed, changed, and sent to one saved device;
Targeted Transfers are absent from the main device list and visible in the selected device's details surface;
receive, resume, cancel, delete, progress, and terminal states survive refresh/restart as defined by the core snapshot;
label failure preserves the draft and retry path;
empty, populated, busy, error, long-name, and destructive-confirmation states are rendered and visually inspected;
ordinary Invitation Transfer flows remain unchanged.

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