style(web): name the opacity ladders, one width scale, severity status colours - #1992

🟢 Confidence 10/10 · safe to merge. The five files the merge re-touched are exact-value token renames, each verified against packages/ui/src/styles/tokens.css:426-435.
_{no findings · tests not needed · risk low}

Names the dashboard's opacity, surface, border and width classes as tokens in packages/ui and normalises severity colours. The merge with main re-touched only five apps/web files, all mechanical swaps that keep the same rendered value.

• bg-muted/50, bg-muted/20, border-border/60 become bg-surface-sunken, bg-surface-faint, border-border-subtle
• text-muted-foreground/70 and /60 collapse onto text-foreground-subtle
• Status and data colours move from success/info/warning to severity-*

_{b4354c8 · Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}