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/cards/CompactCard.tsx

@@ -0,0 +1,53 @@
+import { Box, Card, Typography } from '@mui/material'
+import type { SxProps, Theme } from '@mui/material'
+import type { ReactNode } from 'react'
+
+interface CompactCardProps {
+  title: string
+  meta?: string
+  leading?: ReactNode
+  trailing?: ReactNode
+  onClick?: () => void
+  selected?: boolean
+  sx?: SxProps<Theme>
+}
+
+export function CompactCard({ title, meta, leading, trailing, onClick, selected = false, sx }: CompactCardProps) {
+  return (
+    <Card
+      onClick={onClick}
+      sx={{
+        outline: selected ? '2px solid #1e3a5f' : 'none',
+        outlineOffset: -1,
+        bgcolor: selected ? 'rgba(30,58,95,0.03)' : 'background.paper',
+        cursor: onClick ? 'pointer' : 'default',
+        '&:hover': onClick ? { bgcolor: 'rgba(0,0,0,0.015)' } : {},
+        ...sx,
+      }}
+    >
+      <Box
+        sx={{
+          display: 'flex',
+          alignItems: 'center',
+          gap: 1.5,
+          px: 2,
+          py: 1,
+          minHeight: 48,
+        }}
+      >
+        {leading && <Box sx={{ flexShrink: 0 }}>{leading}</Box>}
+        <Box sx={{ flex: 1, minWidth: 0 }}>
+          <Typography sx={{ fontWeight: 500, fontSize: '0.875rem', lineHeight: 1.3 }} noWrap>
+            {title}
+          </Typography>
+          {meta && (
+            <Typography sx={{ fontSize: '0.75rem', color: 'text.secondary', lineHeight: 1.3 }} noWrap>
+              {meta}
+            </Typography>
+          )}
+        </Box>
+        {trailing && <Box sx={{ flexShrink: 0 }}>{trailing}</Box>}
+      </Box>
+    </Card>
+  )
+}