[xsahil03x]

Linear: FLU-954

Stacked on #3149. Replaces #3140.

What changed

Adds the scheduled messages list to stream_chat_flutter, built on the client-owned list from #3149.

• StreamScheduledMessageListView lists the current user's scheduled messages, or one channel's (cid) or one thread's (parentId). It follows the client's list as it changes and loads it when it isn't fully loaded yet. Same builders and scroll parameters as the other list views (itemBuilder, emptyBuilder, loadingBuilder, errorBuilder, on…Tap/on…LongPress); no pagination, since a user has at most 100 pending scheduled messages.
• StreamScheduledMessageListItem (…Props + DefaultStreamScheduledMessageListItem, overridable through streamChatComponentBuilders(scheduledMessageListItem:)) shows the send time, the channel, the message preview with its thread-reply / quote prefix, and the status: sending, uploading, or why it failed. Styled by the new StreamChatThemeData.scheduledMessageListItemTheme.
• showStreamScheduledMessageActions opens a sheet with the actions the message's status allows — scheduled: edit, reschedule, send now, delete; failed: edit & reschedule, delete; channel deleted: copy text, delete — and returns the chosen ScheduledMessageAction. actionsBuilder adds, removes or reorders rows.
• StreamMessageComposer.onSendLongPress is called when Send is long-pressed while it would send a new message.
• StreamChannelListController.includeScheduledMessages fills each loaded channel's scheduled messages with the channel query.
• Strings in Translations and all 11 locales; the send time is formatted per locale.
• Sample app: a Scheduled tab and per-channel / per-thread lists, with the actions wired to the client.

Why

The list, item and action sheet follow the Figma designs (item, screens) and the SDK's existing list and component patterns. Android and iOS read the same client-owned list for their scheduled screens and use the same channel-name fallback and per-status actions; the React SDK ships the list as a component too.

Verified

• Tests: stream_chat_flutter 1797 (plus item goldens), stream_chat_flutter_core 418, stream_chat_localizations 47, sample app 2.
• dart analyze --fatal-infos clean on all packages; dart format clean.

🤖 Generated with Claude Code

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