Remove hardcoded colors

[rin-st]

Description

Removed hardcoded colors so colors will be better for extensions.

Changes:

general:

• copy button near address and transactions is the same color as default text
• changed input content and placeholder colors
• switch theme toggle color is now text-base-content, so it has the same color as switch icon, has better contrast and also is better for extensions, for example sre-challenges light theme
• changed balance error border color
• changed receipt object keys colors

debug page:

• display variable is now text-base-content/80 and also normal font-weight so it has better contrast with var title

blockexplorer:

• changed color of searchbar placeholder
• changed hardcoded color of pagination button to btn-disabled

Additional Information

• I have read the contributing docs (if this is your first contribution)
• This is not a duplicate of any existing pull request

[portdeveloper]

Just dropped one little nitpicky comment, other than that, it looks good to me!

[technophile-04]

Thanks Rinat this is great!! Just added a couple of small comments

[Pabl0cks]

Nice job @rin-st ! Looks good to me 🙌

[technophile-04]

Tysm @rin-st 🙏!