feat(tracker-web): migrate board + item detail to primitives (UX-2.3)
Board: type/priority pills → StatusDot/StatusBadge tones, count pill →
Badge, quick status-move buttons → Button, load errors → AlertBanner
(keeping the existing TooltipProvider + column accents).
Item detail: title/description editor → Input/Textarea/Button, the
status/priority/visibility selects → shared Select, the vote control →
Button, comment composer → Textarea/Button, errors → AlertBanner.
ActionMenu + Timeline (UX-12.2) are untouched.
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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