Merge remote-tracking branch 'origin/master' into worktree/web-theme-settings-integration-fde706

# Conflicts:
#	.agents/notes/implemented/architecture/2026-07-30-client-locale-full-rollout.i18n.yaml
#	.agents/notes/implemented/architecture/2026-07-30-client-locale-full-rollout.zh.md
#	.agents/notes/implemented/feature/2026-07-30-web-queue-steer-action.i18n.yaml
#	.agents/notes/implemented/feature/2026-07-30-web-queue-steer-action.zh.md
#	.agents/notes/implemented/feature/2026-07-31-browser-derived-initial-locale.i18n.yaml
#	.agents/notes/implemented/feature/2026-07-31-browser-derived-initial-locale.zh.md
#	.agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.i18n.yaml
#	apps/web/tests/scaffold.ts
#	docs/module-graph.md
#	packages/client/runtime/README.i18n.yaml
#	packages/client/runtime/package.json
#	packages/client/test-runtime/README.i18n.yaml
#	packages/client/test-runtime/README.zh.md
#	packages/client/ui-conversation/README.i18n.yaml
#	packages/client/ui-conversation/README.zh.md
#	packages/client/ui-conversation/package.json
#	packages/client/ui-conversation/src/client/apply.ts
#	packages/client/ui-theme/README.i18n.yaml
#	packages/client/ui-theme/README.md
#	packages/client/ui-theme/README.zh.md
#	packages/host/apiproxy/README.i18n.yaml
#	packages/host/apiproxy/README.zh.md
#	pnpm-lock.yaml

packages/client/test-runtime/src/fixtures.ts

@@ -2,6 +2,7 @@
 import type {
   ConversationSnapshot, ISession, SessionId, SessionSummary, WorkspaceListState,
 } from '@deepseek-ai/dsh-client-runtime/client'
+import { EMPTY_CHAT_SNAPSHOT } from '@deepseek-ai/dsh-client-runtime/client'
 
 /**
  * Fixture overrides for the session behavior face: any subset of the
@@ -45,6 +46,7 @@ export interface SessionFixture {
 export function conversationSnapshot(sessionId: SessionId): ConversationSnapshot {
   return {
     sessionId,
+    chat: EMPTY_CHAT_SNAPSHOT,
     nodes: [],
     turnTimings: new Map(),
     turnEnds: new Map(),

packages/client/test-runtime/src/index.ts

@@ -22,7 +22,9 @@ import { act, render, within } from '@testing-library/react'
 import type { RenderResult } from '@testing-library/react'
 import type { queries } from '@testing-library/dom'
 import type { BoundFunctions } from '@testing-library/dom'
-import { SlotsService } from '@deepseek-ai/dsh-client-runtime/client'
+import {
+  ConversationEventRegistry, ConversationViewRegistry, SlotsService,
+} from '@deepseek-ai/dsh-client-runtime/client'
 import { createSlotRenderer } from '@deepseek-ai/dsh-client-web-react'
 import type {
   ChildrenDecl, ComposedProps, OwnerOf, SlotComponent, SlotMap, SlotRendererHost, StoreInstanceLike,
@@ -42,7 +44,7 @@ export type { SessionBehaviorOverrides, SessionFixture, Stabilizer } from './fix
 export { makeTranslate } from './translate.ts'
 export { usePinnedBrowserLanguages } from './locale-env.ts'
 
-/** Erased register face for the internal root call (the public declare seam holds the typing). */
+/** Erased register face for the internal root call (the public declaration contract holds the typing). */
 type ErasedRegister = (options: object, component: unknown) => () => void
 
 /**
@@ -82,7 +84,7 @@ export interface FeatureHandle {
 /**
  * Owner-props cell behind the auto frame: one external store the frame
  * subscribes to, so {@link SlotTestRuntime.renderSlot} and
- * {@link SlotView.update} drive React through the standard uSES seam.
+ * {@link SlotView.update} drive React through the standard uSES boundary.
  */
 class OwnerPropsCell {
   private readonly owners = new Map<string, object>()
@@ -144,11 +146,11 @@ export class TestRoot {
    */
   async declare<const D extends ChildrenDecl>(
     children: D,
-    frame: SlotComponent<ComposedProps<'root', keyof NoInfer<D> & keyof SlotMap & string, undefined, object>>,
+    frame: SlotComponent<ComposedProps<'root', never, keyof NoInfer<D> & keyof SlotMap & string, undefined, object>>,
   ): Promise<void> {
     await this.stabilize(() => {
       // Erased hop (same pattern as SlotsService's own implementation arm);
-      // the declare signature above is the typed seam.
+      // the declaration signature above is the typed contract.
       this.disposeEntry = (this.slots.register as unknown as ErasedRegister)({ name: 'root', children }, frame)
     })
   }
@@ -220,6 +222,8 @@ export class SlotTestRuntime {
     const ctx = new Context()
     const fiber = ctx.plugin(SlotsService)
     await fiber.await()
+    await ctx.plugin(ConversationEventRegistry).await()
+    await ctx.plugin(ConversationViewRegistry).await()
     return new SlotTestRuntime(ctx, ctx.get('slots') as SlotsService)
   }
 
@@ -269,7 +273,7 @@ export class SlotTestRuntime {
 
   /**
    * Render the root slot tree through the ctx-level entry (the shell's own
-   * seam): `ctx.slots.renderSlot('root', {})` under Testing Library.
+   * entry point): `ctx.slots.renderSlot('root', {})` under Testing Library.
    * @returns the Testing Library view.
    */
   renderRoot(): RenderResult {

packages/client/test-runtime/src/sessions.ts

@@ -368,7 +368,7 @@ export class TestSessions implements ISessions {
   }
 
   /**
-   * Read the session scope tag off a context (service-method seam mirror).
+   * Read the session scope tag off a context (service-method boundary mirror).
    * @param ctx - any client context.
    * @returns the session id, or undefined on root contexts.
    */
@@ -430,6 +430,14 @@ export class TestSessions implements ISessions {
     return Promise.resolve()
   }
 
+  /** Apply a confirmed preset switch into the fixture list, as production does. */
+  noteAgentPreset(sessionId: SessionId, agentPreset: string): void {
+    this.list.update((draft) => {
+      const summary = draft.byId[sessionId]
+      if (summary !== undefined) draft.byId[sessionId] = { ...summary, agentPreset }
+    })
+  }
+
   /** Clear the current selection (recorded; the production no-session flow). */
   clear(): void {
     this.calls.push({ method: 'clear', args: [] })