feat(ui): navigate explorer with keyboard

[hi-ogawa]

Description

• Navigate Explorer Tree with Keyboard #11024

AI one shot take. No idea if it's working nor how it's working.

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[userquin]

The tree is a live tree.

This seems to be fine, but we may need to defer adding listeners and maybe adding aria-* attrs until the tree is fully loaded (this approach can be a problem in large projects):

• we may have some bottleneck/memory leaks with the @click listeners (?)
• until tree is not fully loaded we're forcing unnecessary re-layout of every explorer item: all aria-* changing every 100ms

can you click rerun all the tests using the old core project recording performance once all test finished on first run (~5000 tests with 3 projects)?