This is really just a bug. The reuse tab in the reference dialog
always supported keyboard actions (cursor up and down). It was just
impossible to see it because the OOUI base widget we use here doesn't
come with a default styling for this. I suspect this got lost with
some OOUI update years ago. Let's just fix it.
The colors are what OOUI dictates for this situation.
Bug: T360034
Change-Id: I6cfd423830bc0cc86b1aff5dc08a53c49b6e2d9f
Note this actually changes the "subtle" color to be darker. As far
as I understand this is an intentional decision. The old color token
from OOUI is deprecated and intentionally made darker in Codex.
See Ie667c35 and most notably T313502.
Change-Id: I37ad25aa6821d61fe3321e1390d1ccf987075250
Same as in I7e82e03. The extra "shield" element was added in
2013 (!), see Ib244ff6. Back then we couldn't use the CSS property.
But nowadays we can.
Bug: T360034
Bug: T367030
Change-Id: Ib41e062491e65eabc8a52facefe283ba04ce16ff