💚 Fix: Prevent multiple progress bars when receiving Competitive Companion messages

[znzryb]

Problem

When receiving problems from Competitive Companion browser extension, multiple identical "Gathering problems..." progress bars appear simultaneously (typically 5 or more), causing UI clutter and confusion (even in situation of opening one project).

Root

I think the problem was caused by the old implementation: every time I opened the project, a new ProblemGatheringBridge instance would be created, but the old ones weren't being cleaned up. This led to multiple instances running simultaneously, each showing its own progress bar.

What Changed

I refactored ProblemGatheringBridge to be an application-level service instead of a ProjectActivity. Now there's only one instance running across all projects, which means:

• Only one listener on one port
• Proper cleanup when the service stops
• Added an isRunning flag to prevent duplicate starts

Created a separate ProblemGatheringBridgeStarter class that initializes
the service when the first project opens.

Testing

After rebuilding and reinstalling the plugin with this fix, the issue is gone.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...pavel/autocp/gather/base/ProblemGatheringBridge.kt	0.00%	14 Missing ⚠️
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Files with missing lines	Coverage Δ
...pavel/autocp/gather/base/ProblemGatheringBridge.kt	0.00% <0.00%> (ø)

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[Pushpavel]

LGTM