Refine editor titlebar and menu UI

[edisonlee0212]

Summary

• reorganize editor menus into File, Window, and View groups
• replace the centered titlebar text with a titlebar search for entities, layers, and assets
• route search selections through the existing entity, asset, and layer inspector paths
• keep titlebar search state out of the EditorLayer object layout and render results without stealing text focus

Impact

The editor titlebar now provides useful navigation instead of a static app name, while preserving the custom titlebar hit-test behavior. Standalone apps that embed EditorLayer continue to launch because the change avoids altering the public layer layout.

Validation

• python Scripts/format_cpp.py --check --root EvoEngine_SDK/include --root EvoEngine_SDK/src
• cmake --build out/build/vs2026-x64 --config RelWithDebInfo --target EvoEngineEditor DemoApp EcoSysLabApp
• smoke-launched EvoEngineEditor.exe with Resources/EcoSysLabProject/test.eveproj
• smoke-launched DemoApp.exe
• smoke-launched EcoSysLabApp.exe