feat(evidence): add RichTextInput with clipboard paste and wire into FlowPilot

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/flowpilot/FlowPilotStepCard.tsx

@@ -2,7 +2,9 @@ import { useState } from 'react'
 import { MessageSquare, Zap, CheckCircle2, SkipForward, ChevronDown, ChevronUp } from 'lucide-react'
 import { cn } from '@/lib/utils'
 import type { AISessionStepResponse, StepResponseRequest } from '@/types/ai-session'
+import type { FileUploadResponse } from '@/types/upload'
 import { MarkdownContent } from '@/components/ui/MarkdownContent'
+import { RichTextInput } from '@/components/common/RichTextInput'
 import { FlowPilotOptions } from './FlowPilotOptions'
 import { InSessionScriptGenerator } from './InSessionScriptGenerator'
 
@@ -28,6 +30,7 @@ export function FlowPilotStepCard({ step, isCurrentStep, isProcessing, sessionId
   const [freeText, setFreeText] = useState('')
   const [showFreeText, setShowFreeText] = useState(false)
   const [isCollapsed, setIsCollapsed] = useState(!isCurrentStep)
+  const [_freeTextUploads, setFreeTextUploads] = useState<FileUploadResponse[]>([])
 
   const content = step.content as Record<string, unknown>
   const stepText = (content.text as string) || ''
@@ -206,13 +209,13 @@ export function FlowPilotStepCard({ step, isCurrentStep, isProcessing, sessionId
                 </button>
               ) : (
                 <div className="space-y-2">
-                  <textarea
+                  <RichTextInput
                     value={freeText}
-                    onChange={(e) => setFreeText(e.target.value)}
+                    onChange={setFreeText}
+                    onFilesChange={setFreeTextUploads}
+                    sessionId={sessionId}
                     placeholder="Describe what you're seeing..."
-                    className="w-full rounded-lg border border-border bg-card px-3 py-2 text-sm text-foreground placeholder:text-muted-foreground focus:border-[rgba(6,182,212,0.3)] focus:outline-none resize-none"
                     rows={3}
-                    autoFocus
                   />
                   <div className="flex gap-2">
                     <button