Add brain and chat workspace views

Expand the frontend with brain, graph, and chat workspace updates so the
new backend orchestration and memory features have matching screens.
These changes also wire the new APIs into routing and add focused view
and routing tests.

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

frontend/src/api/document.ts

@@ -9,10 +9,26 @@ export interface Document {
   summary?: string
   chunk_count: number
   is_indexed: boolean
+  ingestion_status?: 'uploaded' | 'parsing' | 'indexing' | 'ready' | 'warning' | 'failed'
+  ingestion_error?: string | null
+  indexed_at?: string | null
+  parser_version?: string | null
+  index_version?: string | null
   folder_id?: string | null
   created_at: string
 }
 
+export interface DocumentChunk {
+  id: string
+  chunk_index: number
+  content: string
+  metadata_?: string | null
+}
+
+export interface DocumentChunkUpdate {
+  content: string
+}
+
 export interface SearchResult {
   chunk_id: string
   document_id: string
@@ -29,6 +45,9 @@ export interface UploadResponse {
   title: string
   chunk_count: number
   status: string
+  ingestion_status?: 'uploaded' | 'parsing' | 'indexing' | 'ready' | 'warning' | 'failed'
+  ingestion_error?: string | null
+  indexed_at?: string | null
 }
 
 export const documentApi = {
@@ -54,7 +73,11 @@ export const documentApi = {
   },
 
   getChunks(id: string) {
-    return api.get<any[]>(`/api/documents/${id}/chunks`)
+    return api.get<DocumentChunk[]>(`/api/documents/${id}/chunks`)
+  },
+
+  updateChunk(documentId: string, chunkId: string, payload: DocumentChunkUpdate) {
+    return api.put<DocumentChunk>(`/api/documents/${documentId}/chunks/${chunkId}`, payload)
   },
 
   delete(id: string) {