Create shared status-colors.ts module as single source of truth for all
status and priority color definitions. Replace hardcoded color classes in
StatusIcon, StatusBadge, PriorityIcon, NewIssueDialog, Agents, AgentDetail,
and DesignGuide. Fix inconsistent hues (in_progress was yellow in StatusIcon
but indigo in StatusBadge, blocked was red vs amber). Bump identifier text
from text-xs to text-sm and improve MetricCard label legibility.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>