fix: 🐛 Implement logic to manage voice message playback during recording and manage currently playing voice messages

[japanshah-simform]

Description

Before:

old.mov

After:

Screen.Recording.2026-01-13.at.5.53.32.PM.mov

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

Related Issues

Closes #398

[Copilot]

Pull request overview

This PR introduces a centralized AudioManager singleton to manage voice message playback across the chat application. The implementation prevents multiple voice messages from playing simultaneously and automatically stops playback when recording begins, resolving issue #398.

Key Changes:

• Added AudioManager singleton class to centrally manage audio playback state
• Modified voice message playback logic to use AudioManager instead of direct controller calls
• Implemented automatic playback stop when voice recording starts

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
lib/src/utils/audio_manager.dart	New singleton class managing global audio playback state, ensuring only one voice message plays at a time
lib/src/widgets/voice_message_view.dart	Integrated AudioManager for play/pause operations and added cleanup in dispose to prevent memory leaks
lib/src/widgets/chatui_textfield.dart	Added call to stop all audio playback before starting voice recording
CHANGELOG.md	Documented the breaking change with reference to PR #398

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