feat: F008 AI need builder — smart parse, criteria review, follow-up & weighting

Domain: ParsedNeedCriteria, FollowUpQuestion, ParseNeedResult, NeedBuilderStep, WEIGHTING_KEYS/LABELS. Services: weightingService (asset-type profiles), aiService extended with parseNeed (keyword extraction mock, 1.4s delay) and generateFollowUpQuestions. Components: NeedBuilderProgress, NeedInput, ConfidenceFieldBadge, ExtractedFieldRow, CriteriaReviewPanel, FollowUpQuestionCard, FollowUpPanel, WeightingEditor, NeedCardPreview, NeedBuilderErrorState. Page: AINeedBuilderPage replaces AISearch with 4-step flow (input → review → weighting → save).

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

src/components/demand/ExtractedFieldRow.tsx

@@ -0,0 +1,35 @@
+import { Box, Typography } from '@mui/material'
+import { ConfidenceFieldBadge } from './ConfidenceFieldBadge'
+
+interface Props {
+  label: string
+  value: string
+  confidence: number
+  missing?: boolean
+}
+
+export function ExtractedFieldRow({ label, value, confidence, missing = false }: Props) {
+  return (
+    <Box
+      sx={{
+        display: 'flex',
+        alignItems: 'flex-start',
+        justifyContent: 'space-between',
+        gap: 1,
+        py: 1,
+        borderBottom: '1px solid #f1f5f9',
+        opacity: missing ? 0.55 : 1,
+      }}
+    >
+      <Box sx={{ flex: 1 }}>
+        <Typography variant="caption" color="text.secondary" sx={{ fontWeight: 600, display: 'block' }}>
+          {label}
+        </Typography>
+        <Typography variant="body2" sx={{ fontStyle: missing ? 'italic' : 'normal' }}>
+          {value}
+        </Typography>
+      </Box>
+      <ConfidenceFieldBadge confidence={confidence} />
+    </Box>
+  )
+}