feat(design-system): F003 – complete design system foundation

Design tokens:
- lib/ds.ts: DS_COLORS (resultType/confidence/risk/availability/freshness/dataQuality), scoreToConfidenceLevel(), scoreToDataQualityLevel()
- lib/constants.ts: added CONFIDENCE_LABELS, DATA_QUALITY_LABELS

Badge system (src/components/badges/):
- ResultTypeBadge, ConfidenceBadge, RiskBadge, AvailabilityBadge, FreshnessBadge, DataQualityBadge
- All use DS_COLORS, MUI Chip size=small, lucide icons, German labels from constants

Score components (src/components/scores/):
- ConfidenceScore: numeric % with color from utils.confidenceHex
- DataQualityScore: LinearProgress + qualitative label
- ScoreBar: horizontal bar with label/value/weight
- ScoreBreakdownMini: ScoreFactor[] mapped to ScoreBars with Tooltip explanations

Card system (src/components/cards/):
- DecisionCard: header+badges+score+body+actions, selected/loading/restricted states
- CompactCard: single-row 48px card with leading/trailing slots
- MetricCard: KPI card with label/value/delta/icon (extracted pattern from SupplyDashboard)

Panel system (src/components/panels/):
- InfoPanel: outlined Paper with icon+title header
- DetailPanel: Accordion sections in bordered Paper
- WarningPanel: MUI Alert with warning/critical severity

Table components (src/components/tables/):
- DataTableShell: Paper+TableContainer+Table with loading/empty/toolbar slots
- TableToolbar: flex row with title/count/filters/actions
- FilterBar: deletable Chips with clear-all
- EmptyTableState: centered empty row spanning all cols
- LoadingRows: Skeleton cell rows

Form components (src/components/forms/):
- TextInput: MUI TextField wrapper with onChange(string) signature
- SelectField: generic SelectField<T extends string> with MUI Select
- PriorityChipGroup: togglable Chip set (single/multi select)
- FieldWithConfidence: label+value+ConfidenceBadge for AI-parsed fields

UI additions (src/components/ui/):
- CardSkeleton, PanelLoadingState, UnauthorizedState, RestrictedState

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

src/components/ui/UnauthorizedState.tsx

@@ -0,0 +1,39 @@
+import { Box, Button, Typography } from '@mui/material'
+import { Lock } from 'lucide-react'
+
+interface UnauthorizedStateProps {
+  message?: string
+  onLogin?: () => void
+}
+
+export function UnauthorizedState({ message, onLogin }: UnauthorizedStateProps) {
+  return (
+    <Box
+      sx={{
+        display: 'flex',
+        flexDirection: 'column',
+        alignItems: 'center',
+        justifyContent: 'center',
+        gap: 1.5,
+        py: 6,
+        px: 3,
+        textAlign: 'center',
+      }}
+    >
+      <Lock size={36} color="#94a3b8" />
+      <Typography sx={{ fontWeight: 600, fontSize: '1rem', color: 'text.primary' }}>
+        Nicht berechtigt
+      </Typography>
+      {message && (
+        <Typography sx={{ fontSize: '0.875rem', color: 'text.secondary', maxWidth: 360 }}>
+          {message}
+        </Typography>
+      )}
+      {onLogin && (
+        <Button variant="outlined" size="small" onClick={onLogin}>
+          Anmelden
+        </Button>
+      )}
+    </Box>
+  )
+}