🎨 style(analysis): improve UI clarity and visual hierarchy

Enhance the company analysis overview page with better data presentation
and visual design:

- Fix business description display by filtering raw API data artifacts
- Improve metadata layout with consolidated single-line format
- Fix price chart Y-axis scaling to auto-scale to data range
- Replace 'n/a' with cleaner em dash (—) for empty states
- Add visual indicators and color-coded backgrounds to bull/bear sections
- Improve empty state messaging with centered icons

These changes improve information density, visual hierarchy, and overall
user experience across the analysis page.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

components/analysis/valuation-facts-table.tsx

@@ -8,18 +8,22 @@ type ValuationFactsTableProps = {
 };
 
 function formatRatio(value: number | null) {
-  return value === null ? 'n/a' : `${value.toFixed(2)}x`;
+  return value === null ? '—' : `${value.toFixed(2)}x`;
 }
 
 function formatShares(value: number | null) {
-  return value === null ? 'n/a' : formatScaledNumber(value, { maximumFractionDigits: 2 });
+  return value === null ? '—' : formatScaledNumber(value, { maximumFractionDigits: 2 });
+}
+
+function formatCompactCurrencyOrDash(value: number | null) {
+  return value === null ? '—' : formatCompactCurrency(value);
 }
 
 export function ValuationFactsTable(props: ValuationFactsTableProps) {
   const items = [
     { label: 'Source', value: props.analysis.valuationSnapshot.source },
-    { label: 'Market cap', value: props.analysis.valuationSnapshot.marketCap === null ? 'n/a' : formatCompactCurrency(props.analysis.valuationSnapshot.marketCap) },
-    { label: 'Enterprise value', value: props.analysis.valuationSnapshot.enterpriseValue === null ? 'n/a' : formatCompactCurrency(props.analysis.valuationSnapshot.enterpriseValue) },
+    { label: 'Market cap', value: formatCompactCurrencyOrDash(props.analysis.valuationSnapshot.marketCap) },
+    { label: 'Enterprise value', value: formatCompactCurrencyOrDash(props.analysis.valuationSnapshot.enterpriseValue) },
     { label: 'Shares outstanding', value: formatShares(props.analysis.valuationSnapshot.sharesOutstanding) },
     { label: 'Trailing P/E', value: formatRatio(props.analysis.valuationSnapshot.trailingPe) },
     { label: 'EV / Revenue', value: formatRatio(props.analysis.valuationSnapshot.evToRevenue) },