fix: z-index of highlight layer should be under mode/profile dropdowns

[atlasgong]

Context

change z-index of highlight layer from 1000 to 10, fixes #2386

Screenshots

before	after

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Important

Lowered z-index of highlight layer in ChatTextArea.tsx to ensure it is under dropdowns.

• CSS Changes:
  • Adjust z-index of highlight layer from 1000 to 10 in ChatTextArea.tsx to ensure it is under mode/profile dropdowns.

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[mrubens]

Thanks!