refactor: extract event handler

[appflowy]

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Refactor the UserWorkspaceBloc by extracting event handlers into separate methods to improve code readability and maintainability

Enhancements:

• Extracted complex event handling logic into smaller, focused methods
• Added helper methods to reduce code duplication
• Improved code organization by separating concerns

[sourcery-ai]

Reviewer's Guide

This pull request refactors the UserWorkspaceBloc by extracting the inline logic for each UserWorkspaceEvent into dedicated private handler methods (e.g., _initializeWorkspaces, _handleFetchWorkspaces). This improves modularity and readability, supported by new private helper methods (_sortWorkspaces, _findWorkspaceById, _updateWorkspaceInList) for workspace list manipulation and a _setupListeners method for listener initialization.

File-Level Changes

Change	Details	Files
Decomposed the main event handler by extracting logic for each UserWorkspaceEvent into dedicated private methods.	Moved event-specific processing from the main on<UserWorkspaceEvent> block to new methods such as _initializeWorkspaces, _handleFetchWorkspaces, _handleCreateWorkspace, _handleDeleteWorkspace, _handleOpenWorkspace, _handleRenameWorkspace, _handleUpdateWorkspaceIcon, _handleLeaveWorkspace, and _handleUpdateCurrentWorkspace. Extracted listener setup logic (previously in the initial event handler) into a new _setupListeners method.	frontend/appflowy_flutter/lib/workspace/application/user/user_workspace_bloc.dart
Introduced private helper methods to manage workspace lists and reduce code duplication.	Added _sortWorkspaces method to centralize and consistently apply sorting logic to workspace lists. Added _findWorkspaceById method to simplify retrieving specific workspaces from lists. Added _updateWorkspaceInList method to provide a standardized way to update a workspace within the existing list.	frontend/appflowy_flutter/lib/workspace/application/user/user_workspace_bloc.dart

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[sourcery-ai]

Hey @appflowy - I've reviewed your changes - here's some feedback:

• The new _sortWorkspaces method is a pure function; consider making it static or moving it to a shared utility.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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