Fix iOS cancel-during-launch race with cancellable launch task wrappers

[Kief5555]

This PR fixes a race condition in OpenNOWiOS where tapping Cancel on StreamLoadingView during isLaunchingSession would leave the in-flight api.startSession() running because endSession() early-returned when activeSession == nil. The pending launch would then complete and start the session, ignoring the user's cancel request.

OpenNOWStore.swift:

• Added launchTask private property to track the in-flight launch or resume operation.
• deinit now cancels launchTask in addition to telemetryTask and sessionPollTask.
• Added explicit CancellationError handling in launch() and resumeSession() to dismiss the loading overlay without setting an error when cancelled.
• Added scheduleLaunch(game:) and scheduleResume(candidate:) synchronous wrappers that cancel any existing launchTask and start the new operation.
• Updated endSession() to cancel and nil out launchTask immediately before checking activeSession, ensuring the pending API call is aborted even when activeSession is not yet set.

View Call Sites:

• HomeView.swift: Replaced Task { await store.launch(game:) } with store.scheduleLaunch(game:) in both the featured section and the game grid.
• BrowseView.swift: Replaced Task { await store.launch(game:) } with store.scheduleLaunch(game:).
• LibraryView.swift: Replaced Task { await store.launch(game:) } with store.scheduleLaunch(game:).
• SessionView.swift: Replaced Task { await store.resumeSession(candidate:) } with store.scheduleResume(candidate:).

[capy-ai]

Added 1 comment

[capy-ai]

[🟡 Medium]

scheduleLaunch/scheduleResume can cancel an older task and immediately start a newer one, but the cancelled task’s catch is CancellationError still unconditionally sets showStreamLoading = false, which can hide the loading overlay while the newer launch/resume is still running. This produces incorrect UI state and can let users interact as if launch finished when it has not. Track task identity before mutating shared UI state (e.g., capture a local task token and only clear showStreamLoading if the completing/cancelled task is still launchTask) or move loading-state ownership to the scheduler. ```swift
// ios/OpenNOWiOS/OpenNOWiOS/OpenNOWStore.swift
} catch is CancellationError {
showStreamLoading = false
return
} catch {