feat(ui): Data Flow tab — live lineage graph + PII overlay + movement triggers

New DataFlowView (topology-style): nodes positioned from /api/dataflow with
measured-anchor SVG edges and animated particles (active CDC + running
movements). PII overlay shows shield badges + per-column detail inspector.
Bottom strip triggers ETL movements and toggles the ETL agent. Wired into
SideNav (Data Flow) and App routing; added types + api helpers.

ui/src/types.ts

@@ -70,6 +70,77 @@ export type CdcStats = {
   consumed: number
 }
 
+export type PiiColumn = { name: string; category: string; masked: boolean }
+
+export type DataflowNode = {
+  id: string
+  label: string
+  sub: string
+  kind: string
+  x: number
+  y: number
+  level: string
+  metric: string | null
+  pii?: {
+    has_pii: boolean
+    pii_count: number
+    all_masked: boolean
+    masked_layer: boolean
+    categories: string[]
+    columns: PiiColumn[]
+  }
+}
+
+export type DataflowEdge = {
+  from: string
+  to: string
+  kind: string
+  movement_id?: string
+  state?: string
+  last_rows?: number | null
+  last_duration_s?: number | null
+  active?: boolean
+}
+
+export type DataflowGraph = {
+  ok: boolean
+  nodes: DataflowNode[]
+  edges: DataflowEdge[]
+  pii_summary: { datasets?: number; pii_columns?: number; masked_columns?: number; unmasked_columns?: number }
+  cdc: { connected?: boolean; consumed?: number; window_total?: number }
+  ts: number
+}
+
+export type Movement = {
+  id: string
+  label: string
+  kind: string
+  dag_id: string
+  agent: string
+  from: string
+  to: string
+  last_run?: {
+    state?: string
+    rows?: number | null
+    duration_s?: number | null
+    ended_at?: string
+    started_at?: string
+  } | null
+}
+
+export type PiiDataset = {
+  key: string
+  node_id: string
+  label: string
+  table: string
+  exists: boolean
+  masked_layer: boolean
+  pii_columns: PiiColumn[]
+  pii_count: number
+  has_pii: boolean
+  all_masked: boolean
+}
+
 export type DomainStatus = {
   level: 'ok' | 'warn' | 'down' | 'unknown'
   label: string