[xsahil03x]

Linear: FLU-954

Stacked on #3150. Uses stream_core_flutter from GetStream/stream-core-flutter#216 (StreamInlineNotification, calendar icon).

What changed

Adds scheduling a message to stream_chat_flutter.

• showStreamScheduleMessageSheet offers tomorrow at 09:00, tomorrow at 13:00, next Monday at 09:00 and a custom time, and returns the chosen time. Presets outside the channel's min/max lead time aren't offered; when the channel already holds its maximum of pending scheduled messages, the sheet reads "Limit reached (N max)" and nothing can be picked.
• showStreamScheduleTimeSheet picks a date and time (Material pickers in the design system's styling), previews the message, shows the time zone, and flags a time that's too soon or too far ahead. With onSchedule, it schedules before closing and stays open with the error when that fails. Rescheduling reuses it.
• StreamMessageComposer schedules the message on a long press of Send when the channel has the schedule-message capability and onSendLongPress isn't set — applying preMessageSending, the link check and the dismissed link preview like a send, and clearing the composer once it's scheduled. Not offered while editing, for a command, or while an attachment hasn't uploaded.
• New strings in Translations and all 11 locales; preset and time labels are formatted per locale.
• Sample app: its own scheduling sheets and composer wiring are replaced by the SDK's.

Why

The sheets follow the Figma designs (schedule sheet, custom time) and the SDK's sheet conventions (showStreamSheet + StreamSheetHeader, StreamListTile rows, the dialogs' Cancel / confirm buttons). The presets, the lead-time bounds with a clock-skew buffer, keeping the custom sheet open on failure, and reusing it for reschedule match the React SDK; Android and iOS trigger scheduling with the same long press on Send.

Verified

• Tests: stream_chat_flutter 1844 (plus sheet 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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