Fix: remove draws fetch (API endpoint not available for browser)

The /estimates/{leaid}/draws endpoint doesn't exist - only bulk Parquet
shard access is available. Falls back to interval-based rendering.

src/components/ChartPanel.jsx

@@ -43,26 +43,9 @@ export default function ChartPanel({ district, state }) {
           try { quadData[model] = await api.fetchDistrictEstimates(district.leaid, { model, year: '21-22' }) } catch(e) {} 
         }))
 
-        // Fetch raw posterior draws for Chart 4 (ModelDrawsComparison)
-        const modelDraws = {}
-        await Promise.all(quadrants.map(async (model) => {
-          try { 
-            const result = await api.fetchDistrictDraws(district.leaid, { model, year: '21-22' })
-            // API returns draws array grouped by race/sex - process into usable format
-            if (result?.data) {
-              // Group draws by model for easier access
-              const drawsByGroup = {}
-              result.data.forEach(d => {
-                const key = `${d.race}_${d.sex}`
-                if (!drawsByGroup[key]) drawsByGroup[key] = []
-                drawsByGroup[key].push(d.pred)
-              })
-              modelDraws[model] = drawsByGroup
-            }
-          } catch(e) { 
-            console.error('Failed to fetch draws for', model, e)
-          } 
-        }))
+        // Raw posterior draws are not available via browser API (only bulk Parquet shards)
+        // Falls back to interval-based rendering in charts
+        const modelDraws = null
 
         setData({ waveData, quadData, modelDraws })
       } catch (err) {