feat(worksheets): show enabled scaffolding aids instead of numeric level

Replace '7/10 scaffolding' with descriptive list of enabled aids:
- Example: '30% regrouping, carry boxes, answer boxes, place value colors'
- Example: '50% regrouping, carry boxes, ten-frames'
- Example: '90% regrouping, no scaffolding'

Lists which scaffolding types are enabled (always or conditionally):
- carry boxes
- answer boxes
- place value colors
- ten-frames

More informative and immediately actionable for users.

apps/web/src/app/create/worksheets/addition/components/ConfigPanel.tsx

@@ -415,8 +415,27 @@ export function ConfigPanel({ formState, onChange }: ConfigPanelProps) {
 
                 // Generate custom description
                 const regroupingPercent = Math.round(currentRegrouping * 10)
-                const scaffoldingLevel = Math.round(currentScaffolding)
-                customDescription = `${regroupingPercent}% regrouping, ${scaffoldingLevel}/10 scaffolding`
+
+                // Summarize which scaffolding is enabled
+                const scaffoldingParts: string[] = []
+                if (displayRules.carryBoxes === 'always' || displayRules.carryBoxes === 'whenRegrouping') {
+                  scaffoldingParts.push('carry boxes')
+                }
+                if (displayRules.answerBoxes === 'always' || displayRules.answerBoxes === 'whenRegrouping') {
+                  scaffoldingParts.push('answer boxes')
+                }
+                if (displayRules.placeValueColors === 'always' || displayRules.placeValueColors === 'whenRegrouping') {
+                  scaffoldingParts.push('place value colors')
+                }
+                if (displayRules.tenFrames === 'always' || displayRules.tenFrames === 'whenRegrouping') {
+                  scaffoldingParts.push('ten-frames')
+                }
+
+                const scaffoldingSummary = scaffoldingParts.length > 0
+                  ? scaffoldingParts.join(', ')
+                  : 'no scaffolding'
+
+                customDescription = `${regroupingPercent}% regrouping, ${scaffoldingSummary}`
               }
 
               // Calculate current difficulty position