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/EscalateModal.tsx

@@ -1,7 +1,9 @@
 import { useState } from 'react'
 import { AlertTriangle, Loader2 } from 'lucide-react'
 import { Modal } from '@/components/common/Modal'
+import { RichTextInput } from '@/components/common/RichTextInput'
 import type { EscalateSessionRequest } from '@/types/ai-session'
+import type { FileUploadResponse } from '@/types/upload'
 
 interface EscalateModalProps {
   open: boolean
@@ -9,10 +11,12 @@ interface EscalateModalProps {
   onEscalate: (data: EscalateSessionRequest) => Promise<unknown>
   isProcessing: boolean
   hasPsaTicket: boolean
+  sessionId?: string
 }
 
-export function EscalateModal({ open, onClose, onEscalate, isProcessing, hasPsaTicket }: EscalateModalProps) {
+export function EscalateModal({ open, onClose, onEscalate, isProcessing, hasPsaTicket, sessionId }: EscalateModalProps) {
   const [reason, setReason] = useState('')
+  const [_escalateUploads, setEscalateUploads] = useState<FileUploadResponse[]>([])
 
   const handleSubmit = async () => {
     if (!reason.trim() || reason.trim().length < 5) return
@@ -42,13 +46,13 @@ export function EscalateModal({ open, onClose, onEscalate, isProcessing, hasPsaT
           <label className="mb-1.5 block text-sm font-medium text-foreground">
             Why are you escalating?
           </label>
-          <textarea
+          <RichTextInput
             value={reason}
-            onChange={(e) => setReason(e.target.value)}
+            onChange={setReason}
+            onFilesChange={setEscalateUploads}
+            sessionId={sessionId}
             placeholder="e.g. I've exhausted all networking diagnostics and suspect this is a firewall policy issue that requires senior admin access..."
-            className="w-full rounded-lg border border-border bg-card px-4 py-3 text-sm text-foreground placeholder:text-muted-foreground focus:border-[rgba(6,182,212,0.3)] focus:outline-none resize-none"
             rows={4}
-            autoFocus
           />
           <p className="mt-1 text-[0.625rem] text-[#5a6170]">
             Minimum 5 characters. This will be shown to the engineer who picks up.