Replace the hardcoded slate-*/blue-*/white utility classes on /roadmap
with tokenized equivalents (bg-background/bg-card/text-foreground/
text-muted-foreground/border-border). Swap the type/priority pills to the
shared Badge, the status column/list markers to StatusDot tones, the stat
tiles to MetricCard, search/type filter to Input/Select, the Submit Idea
button to Button, and load/vote errors to AlertBanner. Behaviour, the
board/list SegmentedControl toggle, and the vote-button a11y attrs
(aria-pressed/aria-label) are preserved. The submit + email-prompt modals
are migrated to the shared Modal in UX-3.2.
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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