Copy calculator search result to clipboard

[tgex0]

Description

New feature to copy the calculator search result to the clipboard (by just tapping the calculator search result tile).

Implements #4729

TODO

1. Revert icon to regular calculator.xml (reference in SearchTargetFactory.kt)
2. Add ic_copy.xml icon to right-hand side of calculator search result tile

Type of change

❌ General change (non-breaking change that doesn't fit the below categories like copyediting)
❌ Bug fix (non-breaking change which fixes an issue)
✅ New feature (non-breaking change which adds functionality)
❌ Breaking change (fix or feature that would cause existing functionality to not work as expected)

[tgex0]

Basic functionality works fine but there is no indication that tapping the tile will copy the result to the clipboard. Maybe this is fine as it is.

Rather than adding text somewhere or a further icon, I thought the least intrusive solution might be to change the calculator icon to a combo calculator/copy-to-clipboard icon. Something like this:

Please let me know what you think. Thanks.

[SuperDragonXD]

I'd suggest to add an icon to copy the result to the clipboard (at the right side), as it makes it significantly clear that you can copy the result.

[tgex0]

I agree but, unfortunately, I could not figure out how to do that.

[SuperDragonXD]

I guess we can make the icon a temporary solution as of now (make sure to mark it as TODO).

[tgex0]

OK, I've added and implemented the new combo icon and added a TODO in this PR's description.

[tgex0]

I'll leave this in draft mode as I need to fix the icon...

[tgex0]

Icon is probably OK. I think the problem I experienced with it may be due to #4807.

[tgex0]

Icon not displaying correctly (in Dark theme) is due to #4813. (No problem with icon. Problem was with backup file.)

[tgex0]

TODO tasks complete.