feat: KB Accelerator — convert KB articles into interactive flows

Full-stack implementation of the KB Accelerator feature that converts
static MSP knowledge base articles into interactive troubleshooting
and procedural flows using AI.

Backend:
- Migrations 054/055: kb_imports, kb_import_nodes tables + plan_limits KB columns
- SQLAlchemy models with relationships and self-referential node hierarchy
- Text extraction service (txt, paste, docx with structural metadata)
- AI conversion service with MSP-specialist prompts for both flow types
- 8 API endpoints: upload, get, list, convert, edit node, commit, delete, quota
- Tier-gated access via plan_limits (free: 3 lifetime, pro/team: unlimited)
- 8 integration tests covering upload, get/list, quota, commit, delete

Frontend:
- TypeScript types and API client for all KB Accelerator endpoints
- Multi-step wizard page: upload → processing → review → success
- Upload screen with paste/file tabs, drag-drop, target type selector
- Two-panel review screen with source highlighting and node cards
- Per-node actions: approve, edit, regenerate, insert, delete
- Confidence color indicators (green/amber/red)
- Sidebar navigation with Sparkles icon
- Code-split lazy-loaded route at /kb-accelerator

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/kb-accelerator/NodeCard.tsx

@@ -0,0 +1,201 @@
+import { useState } from 'react'
+import { Check, X, Pencil, Trash2, RotateCcw, Plus, ChevronDown, ChevronUp } from 'lucide-react'
+import { cn } from '@/lib/utils'
+import type { KBImportNode, KBNodeEditRequest } from '@/types/kbAccelerator'
+
+interface NodeCardProps {
+  node: KBImportNode
+  onEdit: (nodeId: string, data: KBNodeEditRequest) => Promise<void>
+  onHighlight: (excerpt: string | null) => void
+}
+
+function confidenceColor(score: number): string {
+  if (score >= 0.85) return 'border-emerald-400/40'
+  if (score >= 0.65) return 'border-amber-400/40'
+  return 'border-rose-500/40'
+}
+
+function confidenceLabel(score: number): string {
+  if (score >= 0.85) return 'High'
+  if (score >= 0.65) return 'Medium'
+  return 'Low'
+}
+
+function confidenceTextColor(score: number): string {
+  if (score >= 0.85) return 'text-emerald-400'
+  if (score >= 0.65) return 'text-amber-400'
+  return 'text-rose-500'
+}
+
+export function NodeCard({ node, onEdit, onHighlight }: NodeCardProps) {
+  const [expanded, setExpanded] = useState(false)
+  const [editMode, setEditMode] = useState(false)
+  const [editContent, setEditContent] = useState('')
+  const [busy, setBusy] = useState(false)
+
+  const question = (node.content?.question as string) ?? ''
+  const options = (node.content?.options as Array<{ label: string; next_node_id?: string }>) ?? []
+  const stepContent = (node.content?.content as string) ?? question
+
+  const handleAction = async (operation: KBNodeEditRequest['operation'], extra?: Partial<KBNodeEditRequest>) => {
+    setBusy(true)
+    try {
+      await onEdit(node.id, { operation, ...extra })
+      if (operation === 'edit') setEditMode(false)
+    } finally {
+      setBusy(false)
+    }
+  }
+
+  const startEdit = () => {
+    setEditContent(stepContent || question)
+    setEditMode(true)
+  }
+
+  return (
+    <div
+      className={cn(
+        'glass-card-static border-l-4 p-4 transition-all',
+        confidenceColor(node.confidence_score),
+        node.user_approved && 'opacity-75',
+      )}
+      onMouseEnter={() => onHighlight(node.source_excerpt)}
+      onMouseLeave={() => onHighlight(null)}
+    >
+      {/* Header */}
+      <div className="flex items-start justify-between gap-3">
+        <div className="flex-1 min-w-0">
+          <div className="flex items-center gap-2 mb-1">
+            <span className="font-label text-[0.625rem] uppercase tracking-[0.1em] text-muted-foreground">
+              {node.node_type}
+            </span>
+            <span className={cn('font-label text-[0.625rem]', confidenceTextColor(node.confidence_score))}>
+              {confidenceLabel(node.confidence_score)} ({Math.round(node.confidence_score * 100)}%)
+            </span>
+            {node.user_approved && (
+              <span className="font-label text-[0.625rem] text-emerald-400">Approved</span>
+            )}
+            {node.user_edited && (
+              <span className="font-label text-[0.625rem] text-blue-400">Edited</span>
+            )}
+          </div>
+
+          {editMode ? (
+            <div className="space-y-2">
+              <textarea
+                value={editContent}
+                onChange={e => setEditContent(e.target.value)}
+                className="w-full rounded-md border border-border bg-card px-3 py-2 text-sm text-foreground focus:border-primary/30 focus:outline-hidden"
+                rows={3}
+              />
+              <div className="flex gap-2">
+                <button
+                  onClick={() => handleAction('edit', { content: { ...node.content, question: editContent, content: editContent } })}
+                  disabled={busy}
+                  className="px-3 py-1.5 text-xs font-medium rounded-md bg-gradient-brand text-[#101114] hover:opacity-90"
+                >
+                  Save
+                </button>
+                <button
+                  onClick={() => setEditMode(false)}
+                  className="px-3 py-1.5 text-xs font-medium rounded-md bg-[rgba(255,255,255,0.04)] border border-[rgba(255,255,255,0.06)] text-foreground"
+                >
+                  Cancel
+                </button>
+              </div>
+            </div>
+          ) : (
+            <p className="text-sm text-foreground">{stepContent || question}</p>
+          )}
+        </div>
+
+        {/* Actions */}
+        {!editMode && (
+          <div className="flex items-center gap-1 shrink-0">
+            {!node.user_approved && (
+              <button
+                onClick={() => handleAction('approve')}
+                disabled={busy}
+                className="p-1.5 rounded-md text-muted-foreground hover:text-emerald-400 hover:bg-emerald-400/10 transition-colors"
+                title="Approve"
+              >
+                <Check size={14} />
+              </button>
+            )}
+            {node.user_approved && (
+              <button
+                onClick={() => handleAction('reject')}
+                disabled={busy}
+                className="p-1.5 rounded-md text-muted-foreground hover:text-amber-400 hover:bg-amber-400/10 transition-colors"
+                title="Unapprove"
+              >
+                <X size={14} />
+              </button>
+            )}
+            <button
+              onClick={startEdit}
+              disabled={busy}
+              className="p-1.5 rounded-md text-muted-foreground hover:text-blue-400 hover:bg-blue-400/10 transition-colors"
+              title="Edit"
+            >
+              <Pencil size={14} />
+            </button>
+            <button
+              onClick={() => handleAction('regenerate')}
+              disabled={busy}
+              className="p-1.5 rounded-md text-muted-foreground hover:text-primary hover:bg-primary/10 transition-colors"
+              title="Regenerate"
+            >
+              <RotateCcw size={14} />
+            </button>
+            <button
+              onClick={() => handleAction('insert_after', { content: { question: 'New node', type: node.node_type } })}
+              disabled={busy}
+              className="p-1.5 rounded-md text-muted-foreground hover:text-primary hover:bg-primary/10 transition-colors"
+              title="Insert after"
+            >
+              <Plus size={14} />
+            </button>
+            <button
+              onClick={() => handleAction('delete')}
+              disabled={busy}
+              className="p-1.5 rounded-md text-muted-foreground hover:text-rose-500 hover:bg-rose-500/10 transition-colors"
+              title="Delete"
+            >
+              <Trash2 size={14} />
+            </button>
+          </div>
+        )}
+      </div>
+
+      {/* Options (troubleshooting) */}
+      {options.length > 0 && (
+        <div className="mt-3">
+          <button
+            onClick={() => setExpanded(!expanded)}
+            className="flex items-center gap-1 text-xs text-muted-foreground hover:text-foreground"
+          >
+            {expanded ? <ChevronUp size={12} /> : <ChevronDown size={12} />}
+            {options.length} option{options.length !== 1 ? 's' : ''}
+          </button>
+          {expanded && (
+            <div className="mt-2 space-y-1 pl-3 border-l border-border">
+              {options.map((opt, i) => (
+                <p key={i} className="text-xs text-muted-foreground">
+                  {opt.label} {opt.next_node_id && <span className="text-[#5a6170]">→ {opt.next_node_id}</span>}
+                </p>
+              ))}
+            </div>
+          )}
+        </div>
+      )}
+
+      {/* Source excerpt */}
+      {node.source_excerpt && (
+        <p className="mt-2 text-xs text-[#5a6170] italic truncate" title={node.source_excerpt}>
+          Source: {node.source_excerpt}
+        </p>
+      )}
+    </div>
+  )
+}

frontend/src/components/kb-accelerator/ReviewScreen.tsx

@@ -0,0 +1,130 @@
+import { useState } from 'react'
+import { CheckCircle2, AlertTriangle, BarChart3 } from 'lucide-react'
+import { cn } from '@/lib/utils'
+import { NodeCard } from './NodeCard'
+import { SourcePanel } from './SourcePanel'
+import type { KBImport, KBNodeEditRequest, KBCommitRequest } from '@/types/kbAccelerator'
+
+interface ReviewScreenProps {
+  kbImport: KBImport
+  onEditNode: (nodeId: string, data: KBNodeEditRequest) => Promise<void>
+  onCommit: (data?: KBCommitRequest) => Promise<void>
+  onDiscard: () => Promise<void>
+  loading: boolean
+}
+
+export function ReviewScreen({ kbImport, onEditNode, onCommit, onDiscard, loading }: ReviewScreenProps) {
+  const [highlightExcerpt, setHighlightExcerpt] = useState<string | null>(null)
+
+  const nodes = kbImport.nodes
+  const approvedCount = nodes.filter(n => n.user_approved).length
+  const lowConfidenceCount = nodes.filter(n => n.confidence_score < 0.65).length
+  const avgConfidence = kbImport.confidence_avg ?? 0
+
+  const title = (kbImport.source_metadata as Record<string, unknown> | null)
+    ?._conversion as Record<string, unknown> | undefined
+  const flowTitle = (title?.title as string) ?? 'Untitled Flow'
+  const flowDescription = (title?.description as string) ?? ''
+
+  return (
+    <div className="flex flex-col h-full gap-4">
+      {/* Header */}
+      <div className="glass-card-static p-4 flex flex-wrap items-center justify-between gap-3">
+        <div>
+          <h2 className="text-lg font-heading font-semibold text-foreground">{flowTitle}</h2>
+          {flowDescription && (
+            <p className="text-sm text-muted-foreground mt-0.5">{flowDescription}</p>
+          )}
+        </div>
+        <div className="flex items-center gap-4">
+          <div className="flex items-center gap-2 text-sm">
+            <BarChart3 size={14} className="text-muted-foreground" />
+            <span className="text-muted-foreground">
+              Avg confidence: <span className="text-foreground font-medium">{Math.round(avgConfidence * 100)}%</span>
+            </span>
+          </div>
+          <div className="flex items-center gap-2 text-sm">
+            <CheckCircle2 size={14} className="text-emerald-400" />
+            <span className="text-muted-foreground">
+              {approvedCount}/{nodes.length} approved
+            </span>
+          </div>
+          {lowConfidenceCount > 0 && (
+            <div className="flex items-center gap-2 text-sm">
+              <AlertTriangle size={14} className="text-amber-400" />
+              <span className="text-amber-400">
+                {lowConfidenceCount} low confidence
+              </span>
+            </div>
+          )}
+        </div>
+      </div>
+
+      {/* Two-panel layout */}
+      <div className="flex-1 grid grid-cols-1 lg:grid-cols-2 gap-4 min-h-0">
+        {/* Source panel */}
+        <div className="overflow-hidden">
+          <SourcePanel
+            sourceText={kbImport.source_text}
+            sourceFormat={kbImport.source_format}
+            highlightExcerpt={highlightExcerpt}
+          />
+        </div>
+
+        {/* Nodes panel */}
+        <div className="flex flex-col glass-card-static overflow-hidden">
+          <div className="flex items-center gap-2 px-4 py-3 border-b" style={{ borderColor: 'var(--glass-border)' }}>
+            <span className="text-sm font-medium text-foreground">Generated Flow</span>
+            <span className="font-label text-[0.625rem] uppercase tracking-[0.1em] text-muted-foreground ml-auto">
+              {kbImport.target_type === 'troubleshooting' ? 'Troubleshooting' : 'Project'}
+            </span>
+          </div>
+          <div className="flex-1 overflow-y-auto p-4 space-y-3">
+            {nodes.map(node => (
+              <NodeCard
+                key={node.id}
+                node={node}
+                onEdit={onEditNode}
+                onHighlight={setHighlightExcerpt}
+              />
+            ))}
+            {nodes.length === 0 && (
+              <p className="text-sm text-muted-foreground text-center py-8">
+                No nodes generated. Try converting again.
+              </p>
+            )}
+          </div>
+        </div>
+      </div>
+
+      {/* Actions */}
+      <div className="flex items-center justify-between gap-3">
+        <button
+          onClick={onDiscard}
+          disabled={loading}
+          className={cn(
+            'px-4 py-2.5 rounded-[10px] text-sm font-medium transition-colors',
+            'bg-[rgba(255,255,255,0.04)] border border-[rgba(255,255,255,0.06)] text-muted-foreground',
+            'hover:text-foreground hover:border-[rgba(255,255,255,0.12)]',
+            'disabled:opacity-50 disabled:cursor-not-allowed'
+          )}
+        >
+          Discard
+        </button>
+        <button
+          onClick={() => onCommit()}
+          disabled={loading || nodes.length === 0}
+          className={cn(
+            'flex items-center gap-2 px-6 py-2.5 rounded-[10px] text-sm font-semibold transition-all',
+            'bg-gradient-brand text-[#101114] shadow-lg shadow-primary/20',
+            'hover:opacity-90 active:scale-[0.97]',
+            'disabled:opacity-50 disabled:cursor-not-allowed'
+          )}
+        >
+          <CheckCircle2 size={16} />
+          {loading ? 'Committing...' : 'Commit to Library'}
+        </button>
+      </div>
+    </div>
+  )
+}

frontend/src/components/kb-accelerator/SourcePanel.tsx

@@ -0,0 +1,42 @@
+import { useMemo } from 'react'
+import { FileText } from 'lucide-react'
+
+interface SourcePanelProps {
+  sourceText: string
+  sourceFormat: string
+  highlightExcerpt: string | null
+}
+
+export function SourcePanel({ sourceText, sourceFormat, highlightExcerpt }: SourcePanelProps) {
+  const renderedText = useMemo(() => {
+    if (!highlightExcerpt || !sourceText.includes(highlightExcerpt)) {
+      return <span>{sourceText}</span>
+    }
+
+    const idx = sourceText.indexOf(highlightExcerpt)
+    return (
+      <>
+        <span>{sourceText.slice(0, idx)}</span>
+        <mark className="bg-primary/20 text-foreground rounded px-0.5">{highlightExcerpt}</mark>
+        <span>{sourceText.slice(idx + highlightExcerpt.length)}</span>
+      </>
+    )
+  }, [sourceText, highlightExcerpt])
+
+  return (
+    <div className="glass-card-static flex flex-col h-full">
+      <div className="flex items-center gap-2 px-4 py-3 border-b" style={{ borderColor: 'var(--glass-border)' }}>
+        <FileText size={16} className="text-muted-foreground" />
+        <span className="text-sm font-medium text-foreground">Source Document</span>
+        <span className="font-label text-[0.625rem] uppercase tracking-[0.1em] text-muted-foreground ml-auto">
+          {sourceFormat}
+        </span>
+      </div>
+      <div className="flex-1 overflow-y-auto p-4">
+        <pre className="text-sm text-muted-foreground whitespace-pre-wrap font-sans leading-relaxed">
+          {renderedText}
+        </pre>
+      </div>
+    </div>
+  )
+}

frontend/src/components/kb-accelerator/SuccessScreen.tsx

@@ -0,0 +1,56 @@
+import { CheckCircle2, ArrowRight, Plus } from 'lucide-react'
+import { cn } from '@/lib/utils'
+import type { KBCommitResponse } from '@/types/kbAccelerator'
+
+interface SuccessScreenProps {
+  result: KBCommitResponse
+  onViewFlow: () => void
+  onConvertAnother: () => void
+}
+
+export function SuccessScreen({ result, onViewFlow, onConvertAnother }: SuccessScreenProps) {
+  return (
+    <div className="max-w-lg mx-auto text-center space-y-6 py-12">
+      <div className="flex justify-center">
+        <div className="w-16 h-16 rounded-full bg-emerald-400/10 flex items-center justify-center">
+          <CheckCircle2 size={32} className="text-emerald-400" />
+        </div>
+      </div>
+
+      <div>
+        <h2 className="text-xl font-heading font-semibold text-foreground">
+          Flow Created Successfully
+        </h2>
+        <p className="text-sm text-muted-foreground mt-2">
+          Your KB article has been converted into a {result.tree_type === 'troubleshooting' ? 'troubleshooting' : 'project'} flow
+          and added to your library.
+        </p>
+      </div>
+
+      <div className="flex flex-col sm:flex-row items-center justify-center gap-3">
+        <button
+          onClick={onViewFlow}
+          className={cn(
+            'flex items-center gap-2 px-6 py-2.5 rounded-[10px] text-sm font-semibold transition-all',
+            'bg-gradient-brand text-[#101114] shadow-lg shadow-primary/20',
+            'hover:opacity-90 active:scale-[0.97]'
+          )}
+        >
+          View Flow
+          <ArrowRight size={16} />
+        </button>
+        <button
+          onClick={onConvertAnother}
+          className={cn(
+            'flex items-center gap-2 px-6 py-2.5 rounded-[10px] text-sm font-medium transition-colors',
+            'bg-[rgba(255,255,255,0.04)] border border-[rgba(255,255,255,0.06)] text-foreground',
+            'hover:border-[rgba(255,255,255,0.12)]'
+          )}
+        >
+          <Plus size={16} />
+          Convert Another
+        </button>
+      </div>
+    </div>
+  )
+}

frontend/src/components/kb-accelerator/UploadScreen.tsx

@@ -0,0 +1,269 @@
+import { useState, useCallback, useRef } from 'react'
+import { Upload, FileText, ClipboardPaste, FileUp, Sparkles, AlertCircle } from 'lucide-react'
+import { cn } from '@/lib/utils'
+import { Textarea } from '@/components/ui/Textarea'
+import { Input } from '@/components/ui/Input'
+import type { KBQuotaResponse } from '@/types/kbAccelerator'
+
+type TargetType = 'troubleshooting' | 'procedural' | 'auto'
+
+interface UploadScreenProps {
+  quota: KBQuotaResponse | null
+  onSubmitText: (content: string, title: string, targetType: TargetType) => void
+  onSubmitFile: (file: File, targetType: TargetType) => void
+  loading: boolean
+}
+
+const TARGET_TYPES = [
+  {
+    value: 'troubleshooting' as const,
+    label: 'Troubleshooting Flow',
+    description: 'Decision tree with diagnostic questions and resolutions',
+  },
+  {
+    value: 'procedural' as const,
+    label: 'Project Flow',
+    description: 'Step-by-step procedure with warnings and variables',
+  },
+  {
+    value: 'auto' as const,
+    label: 'Let AI Decide',
+    description: 'AI will determine the best flow type from your content',
+  },
+]
+
+const FORMAT_LABELS: Record<string, string> = {
+  txt: 'TXT',
+  paste: 'Paste',
+  docx: 'DOCX',
+  pdf: 'PDF',
+  html: 'HTML',
+  md: 'Markdown',
+}
+
+export function UploadScreen({ quota, onSubmitText, onSubmitFile, loading }: UploadScreenProps) {
+  const [mode, setMode] = useState<'paste' | 'file'>('paste')
+  const [content, setContent] = useState('')
+  const [title, setTitle] = useState('')
+  const [targetType, setTargetType] = useState<TargetType>('auto')
+  const [file, setFile] = useState<File | null>(null)
+  const [dragOver, setDragOver] = useState(false)
+  const fileInputRef = useRef<HTMLInputElement>(null)
+
+  const canSubmit = mode === 'paste'
+    ? content.trim().length >= 10
+    : file !== null
+
+  const handleSubmit = () => {
+    if (loading) return
+    if (mode === 'paste') {
+      onSubmitText(content, title, targetType)
+    } else if (file) {
+      onSubmitFile(file, targetType)
+    }
+  }
+
+  const handleDrop = useCallback((e: React.DragEvent) => {
+    e.preventDefault()
+    setDragOver(false)
+    const droppedFile = e.dataTransfer.files[0]
+    if (droppedFile) {
+      setFile(droppedFile)
+      setMode('file')
+    }
+  }, [])
+
+  const handleFileSelect = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const selected = e.target.files?.[0]
+    if (selected) {
+      setFile(selected)
+    }
+  }
+
+  const allowedFormats = quota?.allowed_formats ?? ['txt', 'paste']
+  const fileFormats = allowedFormats.filter(f => f !== 'paste')
+
+  return (
+    <div className="max-w-3xl mx-auto space-y-6">
+      {/* Quota info */}
+      {quota && (
+        <div className="glass-card-static p-4 flex items-center justify-between">
+          <div className="flex items-center gap-3">
+            <Sparkles size={18} className="text-primary" />
+            <div>
+              <p className="text-sm font-medium text-foreground">
+                {quota.lifetime_conversions_limit
+                  ? `${quota.lifetime_conversions_limit - quota.lifetime_conversions_used} conversions remaining`
+                  : 'Unlimited conversions'}
+              </p>
+              <p className="text-xs text-muted-foreground">
+                {quota.plan.charAt(0).toUpperCase() + quota.plan.slice(1)} plan
+              </p>
+            </div>
+          </div>
+          {!quota.can_convert && (
+            <div className="flex items-center gap-2 text-amber-400 text-sm">
+              <AlertCircle size={16} />
+              <span>Conversion limit reached</span>
+            </div>
+          )}
+        </div>
+      )}
+
+      {/* Mode toggle */}
+      <div className="flex gap-2">
+        <button
+          onClick={() => setMode('paste')}
+          className={cn(
+            'flex items-center gap-2 px-4 py-2 rounded-[10px] text-sm font-medium transition-colors',
+            mode === 'paste'
+              ? 'bg-primary/10 text-foreground border border-primary/30'
+              : 'bg-[rgba(255,255,255,0.04)] border border-[rgba(255,255,255,0.06)] text-muted-foreground hover:text-foreground hover:border-[rgba(255,255,255,0.12)]'
+          )}
+        >
+          <ClipboardPaste size={16} />
+          Paste Text
+        </button>
+        {fileFormats.length > 0 && (
+          <button
+            onClick={() => setMode('file')}
+            className={cn(
+              'flex items-center gap-2 px-4 py-2 rounded-[10px] text-sm font-medium transition-colors',
+              mode === 'file'
+                ? 'bg-primary/10 text-foreground border border-primary/30'
+                : 'bg-[rgba(255,255,255,0.04)] border border-[rgba(255,255,255,0.06)] text-muted-foreground hover:text-foreground hover:border-[rgba(255,255,255,0.12)]'
+            )}
+          >
+            <FileUp size={16} />
+            Upload File
+          </button>
+        )}
+      </div>
+
+      {/* Content area */}
+      <div className="glass-card-static p-5 space-y-4">
+        {mode === 'paste' ? (
+          <>
+            <div>
+              <label htmlFor="kb-title" className="block font-label text-[0.625rem] uppercase tracking-[0.1em] text-muted-foreground mb-1.5">
+                Title (optional)
+              </label>
+              <Input
+                id="kb-title"
+                value={title}
+                onChange={e => setTitle(e.target.value)}
+                placeholder="e.g., Outlook Connectivity Troubleshooting"
+                maxLength={255}
+              />
+            </div>
+            <div>
+              <label htmlFor="kb-content" className="block font-label text-[0.625rem] uppercase tracking-[0.1em] text-muted-foreground mb-1.5">
+                KB Article Content
+              </label>
+              <Textarea
+                id="kb-content"
+                value={content}
+                onChange={e => setContent(e.target.value)}
+                placeholder="Paste your KB article text here..."
+                rows={12}
+                maxLength={500000}
+              />
+              <p className="mt-1 text-xs text-muted-foreground">
+                {content.length.toLocaleString()} / 500,000 characters
+              </p>
+            </div>
+          </>
+        ) : (
+          <div
+            onDragOver={e => { e.preventDefault(); setDragOver(true) }}
+            onDragLeave={() => setDragOver(false)}
+            onDrop={handleDrop}
+            onClick={() => fileInputRef.current?.click()}
+            className={cn(
+              'flex flex-col items-center justify-center gap-3 p-10 rounded-xl border-2 border-dashed cursor-pointer transition-colors',
+              dragOver
+                ? 'border-primary/50 bg-primary/5'
+                : 'border-[rgba(255,255,255,0.08)] hover:border-[rgba(255,255,255,0.15)]'
+            )}
+          >
+            {file ? (
+              <>
+                <FileText size={32} className="text-primary" />
+                <div className="text-center">
+                  <p className="text-sm font-medium text-foreground">{file.name}</p>
+                  <p className="text-xs text-muted-foreground mt-1">
+                    {(file.size / 1024).toFixed(1)} KB
+                  </p>
+                  <button
+                    onClick={e => { e.stopPropagation(); setFile(null) }}
+                    className="mt-2 text-xs text-primary hover:underline"
+                  >
+                    Remove
+                  </button>
+                </div>
+              </>
+            ) : (
+              <>
+                <Upload size={32} className="text-muted-foreground" />
+                <div className="text-center">
+                  <p className="text-sm text-foreground">
+                    Drop a file here or <span className="text-primary">browse</span>
+                  </p>
+                  <p className="text-xs text-muted-foreground mt-1">
+                    Supported: {fileFormats.map(f => FORMAT_LABELS[f] || f.toUpperCase()).join(', ')}
+                  </p>
+                </div>
+              </>
+            )}
+            <input
+              ref={fileInputRef}
+              type="file"
+              className="hidden"
+              accept={fileFormats.map(f => `.${f}`).join(',')}
+              onChange={handleFileSelect}
+            />
+          </div>
+        )}
+      </div>
+
+      {/* Target type selector */}
+      <div>
+        <p className="font-label text-[0.625rem] uppercase tracking-[0.1em] text-muted-foreground mb-2">
+          Target Flow Type
+        </p>
+        <div className="grid grid-cols-1 sm:grid-cols-3 gap-3">
+          {TARGET_TYPES.map(t => (
+            <button
+              key={t.value}
+              onClick={() => setTargetType(t.value)}
+              className={cn(
+                'glass-card-static p-4 text-left transition-all',
+                targetType === t.value
+                  ? 'border-primary/30 bg-primary/5'
+                  : 'hover:border-[rgba(255,255,255,0.12)]'
+              )}
+            >
+              <p className="text-sm font-medium text-foreground">{t.label}</p>
+              <p className="text-xs text-muted-foreground mt-1">{t.description}</p>
+            </button>
+          ))}
+        </div>
+      </div>
+
+      {/* Submit */}
+      <button
+        onClick={handleSubmit}
+        disabled={!canSubmit || loading || (quota != null && !quota.can_convert)}
+        className={cn(
+          'w-full flex items-center justify-center gap-2 px-6 py-3 rounded-[10px] text-sm font-semibold transition-all',
+          'bg-gradient-brand text-[#101114] shadow-lg shadow-primary/20',
+          'hover:opacity-90 active:scale-[0.97]',
+          'disabled:opacity-50 disabled:cursor-not-allowed'
+        )}
+      >
+        <Sparkles size={16} />
+        {loading ? 'Converting...' : 'Convert to Flow'}
+      </button>
+    </div>
+  )
+}

frontend/src/components/layout/Sidebar.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useState } from 'react'
-import { LayoutGrid, Box, PenLine, Clock, FileText, Bookmark, BarChart3, Settings, PanelLeftClose, PanelLeftOpen, MessageSquareText, BotMessageSquare, BookOpen } from 'lucide-react'
+import { LayoutGrid, Box, PenLine, Clock, FileText, Bookmark, BarChart3, Settings, PanelLeftClose, PanelLeftOpen, MessageSquareText, BotMessageSquare, BookOpen, Sparkles } from 'lucide-react'
 import { cn } from '@/lib/utils'
 import { useUserPreferencesStore } from '@/store/userPreferencesStore'
 import { usePinnedFlowsStore } from '@/store/pinnedFlowsStore'
@@ -83,6 +83,7 @@ export function Sidebar() {
             <NavItem href="/shares" icon={FileText} label="Exports" collapsed />
             <NavItem href="/assistant" icon={BotMessageSquare} label="AI Assistant" collapsed />
             <NavItem href="/step-library" icon={Bookmark} label="Step Library" collapsed />
+            <NavItem href="/kb-accelerator" icon={Sparkles} label="KB Accelerator" collapsed />
             <NavItem href="/analytics" icon={BarChart3} label="Analytics" collapsed />
             <NavItem href="/guides" icon={BookOpen} label="User Guides" collapsed />
             <NavItem href="/feedback" icon={MessageSquareText} label="Feedback" collapsed />
@@ -115,6 +116,7 @@ export function Sidebar() {
             <NavItem href="/shares" icon={FileText} label="Exports" />
             <NavItem href="/assistant" icon={BotMessageSquare} label="AI Assistant" />
             <NavItem href="/step-library" icon={Bookmark} label="Step Library" />
+            <NavItem href="/kb-accelerator" icon={Sparkles} label="KB Accelerator" />
             <NavItem href="/analytics" icon={BarChart3} label="Analytics" />
           </div>
         </>