Summary

Fixes the window freeze issue when clicking cross-graph links.

Closes #12132

Root Cause

The freeze was caused by two problems in the cross-graph navigation flow:

1. Database persistence deadlock: broadcast-persist-graph! waited indefinitely for a renderer response that could never come
2. File system watcher race condition: File watchers were closed prematurely due to timing issues in window registration

Changes Made

1. Fixed Database Persistence Deadlock

• Added 3-second timeout protection to broadcast-persist-graph! function
• Prevents indefinite waiting for renderer response
• Includes proper cleanup of timeout handlers
• Added warning logging for timeout cases

2. Fixed File Watcher Race Condition

• Reordered operations in set-current-graph! to update window mapping first
• Added 100ms delay before checking for orphaned watchers
• Ensures new windows are properly registered before cleanup decisions

3. Added Extra Safety

• Added additional timeout protection in URL handler with 3.5s timeout
• Double-layer protection against persistence blocking

Testing

• Reproduced original freeze issue on development build
• Applied fixes and verified cross-graph linking works without freezing
• Original window remains responsive after cross-graph navigation
• New window opens correctly and is functional

Files Changed

• src/electron/electron/handler.cljs: Fixed persistence deadlock and watcher race condition
• src/electron/electron/url.cljs: Added additional timeout protection

This fix resolves a timing-sensitive race condition that particularly affected Linux users with multiple graph workflows.