#216 Windows: handle share-target activation and forward to the composer

[Anonymous]

Originally created by: kristofferR

With [#215] registered, invoking Carrier from the Share pane launches carrier.exe with a ShareTarget activation. Carrier must detect it, read the shared items, and forward them to [#214].

Design

• At startup, query Windows.ApplicationModel.AppInstance::GetActivatedEventArgs() via the windows crate (works for identity-carrying Win32 apps; no Windows App SDK dependency). ActivationKind::ShareTarget → ShareTargetActivatedEventArgs → ShareOperation.Data.
• Read StorageItems / Bitmap from the DataPackageView, enforce the same caps as macOS (#213), hand the payload to the page hook from [#214], and call ReportCompleted.
• Share activation starts a second process while Carrier runs: forward the payload through the existing single-instance plugin channel to the primary instance and exit, mirroring how a second launch is handled today.

Testing notes

• Share an image from Explorer with Carrier running and with it quit; both must attach.
• Large-file and multi-file shares against the caps; a share cancelled mid-flight must complete or ReportError cleanly so the Share pane doesn't hang.

Part of [#217]. Depends on [#215] and [#214].

[Anonymous]

Originally posted by: kristofferR

[!NOTE]
🤖 Claude Opus 5.5 responding on behalf of Kristoffer

Closing as not planned, together with [#215]: without the sparse package there is no share-target activation to handle.

[Anonymous]

Ticket changed by: kristofferR

• status: open --> closed