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Uploads are now workspace-scoped: the chat session is created and attachments are bound to the message at send time, so a paste/drop no longer creates an empty session the user never sends. - LinkAttachmentsToChatMessage returns the ids it actually bound; the client diffs requested-vs-bound and warns on partial bind, replacing an extra listChatMessagesPage fetch. - Cancelling an empty chat task detaches attachments before deleting the user message (attachment FK is ON DELETE CASCADE) and returns them via cancelled_chat_message.attachments, so a restored draft can re-bind. - SendChatMessageResponse.attachment_ids has no omitempty: "requested but bound zero" serializes [] so the client can tell it apart from an older server and still warn. - Send is fire-and-forget: it no longer steals focus when the user has navigated to another session (guarded on the live store + new-chat agent id); the reply surfaces via the unread dot. commitInput gets clearEditor so a navigated-away commit doesn't wipe the editor now showing another session, while still clearing the sent draft's data. - Draft restore is session-aware so a failed fire-and-forget send restores into the session it was sent from, never the one the user moved to. - Removed the now-unreferenced migrateInputDraft store action. Verified: core/views typecheck, chat-input (15) / store (3) / api client (24) unit tests, go build + vet, handler SendChatMessage + CancelTaskByUser DB tests. Full make check / E2E left to CI. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>