fix: unable to expand sidebar on Windows

[LucasXu0]

Feature Preview

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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

Bug Fixes:

• Ensure the sidebar toggles between expanded and hidden states when clicked, instead of always hiding.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request fixes an issue where the sidebar could not be expanded on Windows. The fix involves modifying the onPointerDown handler for the sidebar control area to toggle the sidebar's visibility (expand/collapse) based on its current state, rather than always hiding it.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Modify sidebar collapse/expand logic	Check current sidebar expansion status Toggle sidebar status based on current state	frontend/appflowy_flutter/lib/workspace/presentation/home/home_stack.dart

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[sourcery-ai]

Hey @LucasXu0 - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a brief explanation in the description on how this platform-agnostic code change addresses the Windows-specific issue mentioned in the title.

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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