Route streamed LLM events to target windows instead of broadcasting

[Ayushpal2006]

Summary

This PR optimizes streamed LLM IPC routing.

Changes

• Route streamed LLM events through targeted window delivery instead of broadcasting to every Electron window.
• Add a reusable sendToWindow() helper to WindowManager.
• Reduce logging overhead for high-frequency *-chunk streaming events.

Benefits

• Less unnecessary IPC traffic.
• Reduced renderer work for hidden windows.
• Lower logging overhead during streamed responses.
• Preserves existing response behavior while making event routing more efficient.

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