fix: restore ordinary points to white, tint only the high-score highlight

[ericboehs]

Tinting every point flattened the distinction light mode draws between an ordinary score and one above the next threshold. Dropping the blanket .points rule lets ordinary points fall back to exactly what they rendered before any of this.

Verified in the browser per scheme:

	story title	ordinary points	high-score points
dark	rgb(255,255,255)	rgb(255,255,255)	rgb(88,166,255)
light	rgb(13,13,13)	rgb(13,13,13)	rgb(30,135,240)

Dark mode now mirrors light mode's structure rather than inventing its own: ordinary points match the titles, and only the high-score highlight is tinted.

The explicit visited rule goes too. It was only needed because the blanket rule outranked the global table a:visited; without it the original cascade applies unchanged, so clicked stories dim to grey exactly as before.

Rejected one review finding

A reviewer flagged the comment as inaccurate, claiming ordinary points render UIkit's default link blue #1e87f0 rather than white, since they're anchors.

That's contradicted by both the stylesheet and the browser. UIkit 3.3.3's .uk-light rule targets anchors explicitly:

.uk-light .uk-link, .uk-light a, ... { color: #fff }

and the measured computed style for an unvisited ordinary point is rgb(255,255,255). The comment stands as written.

Tests: 119 runs, 320 assertions.