feat(web): add basic past-session search (round 1)

packages/client/runtime/tests/fake-api.ts

@@ -3,7 +3,7 @@
 // deferred-controlled timing). Streams are hand pumps: pushMux/pushHost.
 import type {
   ClientResponse, CommandDescriptor, CommandExecuteResult, HostFrame, IApiClient, MuxFrame,
-  RpcError, RpcReceipt, RpcRequest, RpcResponse, SessionId, SkillEntry,
+  RpcError, RpcReceipt, RpcRequest, RpcResponse, SessionId, SessionSearchItem, SkillEntry,
   WorkspaceId, WorkspaceView,
 } from '@deepseek-ai/dsh-client-connection/client'
 import { RpcId } from '@deepseek-ai/dsh-client-connection/client'
@@ -60,6 +60,8 @@ export class FakeApiClient implements IApiClient {
 
   // Programmable slots (defaults answer OK-empty); reassign per case.
   onList: (payload: unknown) => Promise<RpcResponse<{ items: never[] }>> = () => Promise.resolve(ok({ items: [] }))
+  onSearch: (payload: unknown) => Promise<RpcResponse<{ items: SessionSearchItem[]; hasMore: boolean }>> =
+    () => Promise.resolve(ok({ items: [], hasMore: false }))
   onCreate: (payload: unknown) => Promise<RpcResponse<{ sessionId: SessionId }>> = () => Promise.resolve(ok({ sessionId: 'fk-new' as SessionId }))
   onHistory: (payload: { sessionId: SessionId; beforeSeq?: number; maxMessages?: number })
   => Promise<RpcResponse<{ events: never[]; hasMore: boolean }>> =
@@ -72,12 +74,17 @@ export class FakeApiClient implements IApiClient {
 
   private readonly muxConns: StreamConn<MuxFrame>[] = []
   private readonly hostConns: StreamConn<HostFrame>[] = []
+  lastSearchSignal: AbortSignal | undefined
 
   // Parameters carry local structural annotations: the CI lint lane runs
   // without built lib/, so IApiClient's indexed-access types collapse to any
   // and inferred parameters would trip no-unsafe-argument.
   readonly sessions: IApiClient['sessions'] = {
     list: (payload: unknown) => this.record('session.list', payload, this.onList(payload)),
+    search: (payload: unknown, signal?: AbortSignal) => {
+      this.lastSearchSignal = signal
+      return this.record('session.search', payload, this.onSearch(payload))
+    },
     create: (payload: unknown) => this.record('session.create', payload, this.onCreate(payload)),
     history: (payload: { sessionId: SessionId; beforeSeq?: number; maxMessages?: number }) =>
       this.record('session.history', payload, this.onHistory(payload)),