Change OutlineListItem color for dark mode to `gray.700`.

The title should have `gray.300` color in dark mode.

The color for `TransactionDetailsItem` and `TransactionDetailsAmountItem` should
be `gray.300` for the dark mode.

Labels such as "step 1" or "Minting/Minted", "Unminting/Unminted" should be
colored with `brand.300` for the dark mode.

The color of step indicator and the horizontal line next to the step should be
`brand.300` for dark mode.

- change the white base color of the gradient to #323A47 (`gray.800`)
- change the color of amounts to `brand.300`

- change body text to `gray.300` for dark mode
- change placeholder text for the input to `gray.500` for dark mode

- replace the Metric Box background color to `gray.700` in dark mode
- replace the background color of odd row (history rows) to `gray.700` in dark
mode

This will prevent eny errors in the console.