feat: implement two-sided pagination

[demchenkoalex]

#824

[Copilot]

Pull Request Overview

This PR implements two-sided pagination functionality for the Flutter chat UI, allowing users to load both older messages (towards the top) and newer messages (towards the bottom) of the chat.

Key changes:

• Added onStartReached callback for loading newer messages at the bottom of the chat
• Extended LoadMoreNotifier to track separate loading states for older and newer messages
• Added animated parameter to chat controller operations to control animation behavior during pagination
• Updated pagination examples to demonstrate both older and newer message loading

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/flutter_chat_ui/lib/src/utils/load_more_notifier.dart	Refactored to support separate loading states for older vs newer messages
packages/flutter_chat_ui/lib/src/load_more.dart	Simplified LoadMore widget by removing height measurement functionality
packages/flutter_chat_ui/lib/src/chat_animated_list/chat_animated_list_reversed.dart	Added support for onStartReached callback and startPaginationThreshold
packages/flutter_chat_ui/lib/src/chat_animated_list/chat_animated_list.dart	Added comprehensive two-sided pagination logic with scroll anchoring
packages/flutter_chat_core/lib/src/chat_controller/in_memory_chat_controller.dart	Added animated parameter to all message operations
packages/flutter_chat_core/lib/src/chat_controller/chat_operation.dart	Extended ChatOperation to include animated flag
examples/flyer_chat/lib/pagination_older.dart	Refactored existing pagination example to focus on older messages
examples/flyer_chat/lib/pagination_newer.dart	New example demonstrating newer message pagination
examples/flyer_chat/lib/pagination_mock_database.dart	Extracted mock database logic for shared use across examples
examples/flyer_chat/lib/main.dart	Updated navigation to include both pagination examples
examples/flyer_chat/lib/hive_chat_controller.dart	Added animated parameter support to Hive implementation

Comments suppressed due to low confidence (1)

examples/flyer_chat/lib/pagination_older.dart:115

• Typo in comment: 'reserved' should be 'reversed'.

      // If the list is reversed, we might need to add an offset that

[demchenkoalex]

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