feat(F020): frontend infrastructure foundation

- src/lib/constants.ts: centralized route paths, labels, thresholds
- src/lib/utils.ts: formatting, color helpers, math utils
- src/hooks/: useProperties, useMatches, useFutureSignals, useNeeds
- src/components/scores/MatchScoreRing
- src/components/data-quality/DataQualityBar
- src/components/future-signals/SignalTypeBadge
- src/components/cards/SourceTypeBadge
- src/provider/AuthProvider (placeholder, swappable)
- main.tsx: AuthProvider + centralized stale time

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/future-signals/SignalTypeBadge.tsx

@@ -0,0 +1,28 @@
+import { Chip } from '@mui/material'
+import type { SignalType } from '../../domain/enums'
+import { SIGNAL_TYPE_LABELS } from '../../lib/constants'
+
+interface SignalTypeBadgeProps {
+  type: SignalType
+  size?: 'small' | 'medium'
+}
+
+const COLOR_MAP: Record<string, { bg: string; color: string }> = {
+  EXPANSION:            { bg: 'rgba(26,122,74,0.12)',  color: '#1a7a4a' },
+  POSSIBLE_MOVE_OUT:    { bg: 'rgba(217,119,6,0.12)',  color: '#d97706' },
+  CONSTRUCTION_PROJECT: { bg: 'rgba(37,99,235,0.12)',  color: '#1d4ed8' },
+  RESTRUCTURING:        { bg: 'rgba(234,88,12,0.12)',  color: '#c2410c' },
+  PROJECT_DEVELOPMENT:  { bg: 'rgba(124,58,237,0.12)', color: '#6d28d9' },
+  SPACE_CONSOLIDATION:  { bg: 'rgba(100,116,139,0.12)',color: '#475569' },
+}
+
+export function SignalTypeBadge({ type, size = 'small' }: SignalTypeBadgeProps) {
+  const { bg, color } = COLOR_MAP[type] ?? { bg: '#f1f5f9', color: '#475569' }
+  return (
+    <Chip
+      label={SIGNAL_TYPE_LABELS[type] ?? type}
+      size={size}
+      sx={{ bgcolor: bg, color, fontWeight: 600, border: 'none' }}
+    />
+  )
+}

src/components/future-signals/index.ts

@@ -0,0 +1 @@
+export { SignalTypeBadge } from './SignalTypeBadge'