Fix: milestone list uses natural language sentences instead of X/checkmark

Replace checkmark/X symbol format with plain numbered sentences:
achieved → 'Can walk independently'
not achieved → 'Cannot walk' / 'Does not yet use 2-word sentences'

src/utils/prompts.js

@@ -167,7 +167,8 @@ ${CORE_RULES}
 - ONLY list milestones that were assessed (Yes or No)
 - Do NOT list unassessed milestones
 - Group by domain with clear subsection headers
-- Format: "✓ [milestone]" for achieved, "✗ [milestone]" for not achieved
+- Write each milestone as a plain numbered sentence: achieved milestones start with "Can" or "Does" (e.g. "1. Can run independently"), not-achieved milestones start with "Cannot" or "Does not" (e.g. "2. Cannot walk without support", "3. Does not yet use 2-word sentences")
+- Never use checkmarks, X symbols, or bullet points
 - Add brief overall summary at end`,
 
   milestoneSummary: `You are a pediatric documentation specialist.