Fix dark mode styling for disabled GPU dialog

[CodeVishal-17]

fixes #785

Summary

Fixes dark mode UI inconsistencies in the disabled GPU dialog.

Changes

• Improved disabled input visibility in dark mode
• Added better contrast for disabled fields
• Unified styling between GPU Count and GPU Type fields
• Improved readability and overall dark mode consistency

[google-oss-prow]

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[ada333]

@CodeVishal-17 thanks for the changes!

the input fields look different:

also there is code duplication since you are using the same style twice

Could you please try to fix the code changes so the input fields (on all dialogs) look the same and there is minimal code duplication?

[CodeVishal-17]

Thanks for the review! I updated the implementation to reduce code duplication and aligned the disabled input styling more closely with the existing dialog styles.