Fix race condition on resource tab reload

[TheodoreSpeaks]

Summary

Brief description of what this PR does and why.

Fixes #(issue)

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Other: ___________

Testing

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Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Apr 5, 2026 1:45am

[TheodoreSpeaks]

@BugBot review

[cursor]

PR Summary

Low Risk
Low risk UI-state change that only affects URL syncing for the active resource; main risk is subtle navigation/history behavior differences.

Overview
Fixes a race in Home where the URL could be rewritten before an activeResourceId is established.

The activeResourceId→URL sync effect now skips its first run until a resource has been set at least once (via hasSetResourceRef), and it clears url.hash before calling history.replaceState to avoid persisting stale fragments when updating the resource query param.

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^{Reviewed by Cursor Bugbot for commit c8c2b0d. Configure here.}