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

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

@@ -3,7 +3,7 @@
 // deferred-controlled timing). Streams are hand pumps: pushMux/pushHost.
 import type {
   CommandDescriptor, CommandExecuteResult, HostFrame, IApiClient, MuxFrame,
-  RpcRequest, RpcResponse, SessionId, SkillEntry,
+  RpcRequest, RpcResponse, SessionId, SessionSearchItem, SkillEntry,
 } from '../src/client/api.ts'
 import { RpcId } from '../src/client/api.ts'
 
@@ -43,6 +43,8 @@ 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 }>> =
@@ -55,12 +57,17 @@ export class FakeApiClient implements IApiClient {
 
   private readonly muxConns: StreamConn<MuxFrame>[] = []
   private readonly hostConns: StreamConn<HostFrame>[] = []
+  lastSearchSignal: AbortSignal | undefined
 
   // Parameter annotations below are local structural types on purpose: the CI
   // lint lane runs without built artifacts, where IApiClient's wire types
   // (apiproxy subpath) resolve to any and inferred params 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)),