## What
Bump the dark-mode `--input` color from `oklch(0.269)` to `oklch(0.41)`.
## Why
In dark mode the `--input` value sat almost on top of the background
(`oklch(0.225)`), so the shared `border-input` was nearly invisible on
every form control. Checkboxes were especially hard to spot.
Since inputs, checkboxes, radios, selects and textareas all share
`border-input`, this single variable raises their border contrast at
once (Δ luminosity vs background goes from 0.044 → 0.185) while staying
below the focus ring (`0.439`), so focus still stands out and every
control keeps a consistent design.
As a nice side effect, the subtle `bg-input/30` and `bg-input/50` fills
(radio, outline button) also read a touch more clearly.
83a5e9657e