refactor(gui): move the snapshot-store engine into the client runtime

The data layer no longer depends on the React glue package, and business
plugins no longer depend on web-react at all:

- The store engine (zustand vanilla + immer + persist + dev freeze),
  defineStore, and shallowEqual move to @deepseek-ai/dsh-client-runtime,
  exported from the ./client main entry — no ./store subpath survives on
  either package (the web-react one is deleted, none is opened on runtime).
- Store products are bare snapshot sources: useSelector leaves
  SnapshotStore/StoreInstance and Session; every hook is composed at the
  binding site in web-react's renderer (per-source cached uSES binding).
  The SlotRendererHost sessions face carries bare observables only.
- SessionProvider becomes a standard-kit seat: an entry whose children
  declare a session-scope slot receives the framework component as a prop,
  retiring the last value import of web-react from plugin packages.
  UseSession and the session-area types now live in ui-slots.
- web-react shrinks to the shell-only React glue (renderer, providers,
  uSES bridge); zustand/immer belong to runtime alone; the module-table
  seed and tsdown externals drop the web-react/store seat.
- NODE_ENV replacement is defined once in the shared tsdown client preset
  (browser bundles inline the engine and lost vite's define); the 3-line
  process.env typecheck shim moves to runtime with the engine.
- Stray tsc artifacts (.js/.d.ts/.d.ts.map beside sources under src/)
  swept repo-wide; they shadow real sources under vitest resolution.

Verified: both aggregate typecheck programs at zero; 604 client tests
green; repo-wide grep for web-react/store at zero; real-host playwright
run 7/7 including persist round-trip.

ci: fix test/docs

packages/client/ui-sidebar/package.json

@@ -38,7 +38,6 @@
     "@deepseek-ai/dsh-client-ui-layout": "workspace:^",
     "@deepseek-ai/dsh-client-ui-primitives": "workspace:^",
     "@deepseek-ai/dsh-client-ui-slots": "workspace:^",
-    "@deepseek-ai/dsh-client-web-react": "workspace:^",
     "clsx": "^2.0.0",
     "react": "^18.2.0"
   },

packages/client/ui-sidebar/tests/apply.spec.tsx

@@ -8,7 +8,7 @@
  */
 import { Context } from 'cordis'
 import { describe, expect, it, vi } from 'vitest'
-import { createSnapshotStore } from '@deepseek-ai/dsh-client-web-react/store'
+import { createSnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
 import { SlotsService } from '@deepseek-ai/dsh-client-runtime/client'
 import type { SessionId, SessionListState } from '@deepseek-ai/dsh-client-runtime/client'
 import { apply, inject } from '@deepseek-ai/dsh-client-ui-sidebar/client'

packages/client/ui-sidebar/tests/sidebar-root.spec.tsx

@@ -9,13 +9,19 @@
  */
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { cleanup, fireEvent, render, screen } from '@testing-library/react'
-import { act } from 'react'
-// Engine subpath: createSnapshotStore left the public face (wave 3); the
-// engine remains the sanctioned stub source for the standard hooks in tests.
-import { createSnapshotStore } from '@deepseek-ai/dsh-client-web-react/store'
+import { act, useSyncExternalStore } from 'react'
+// Engine home: runtime/client since the store migration; the engine carries
+// no hook (runtime is React-free), so the spec binds the selector locally.
+import { createSnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
 import type { SessionId, SessionListState, SessionSummary } from '@deepseek-ai/dsh-client-runtime/client'
 import { SidebarRoot } from '../src/client/SidebarRoot.tsx'
 
+/** Minimal selector hook over an engine store (production binding lives in the renderer). */
+function hookOf<T>(src: { getSnapshot(): T; subscribe(fn: () => void): () => void }) {
+  return <S,>(sel: (s: T) => S, _eq?: (a: S, b: S) => boolean): S =>
+    sel(useSyncExternalStore(src.subscribe.bind(src), src.getSnapshot.bind(src)))
+}
+
 const sid = (s: string) => s as SessionId
 
 /** Bare-string init; brands ids and omits absent optional keys (exactOptionalPropertyTypes). */
@@ -59,7 +65,7 @@ function mount(...summaries: SessionSummary[]) {
     <SidebarRoot
       collapsed={false}
       width={300}
-      useSessions={sessions.useSelector}
+      useSessions={hookOf(sessions)}
       onOpen={onOpen}
       onCreate={onCreate}
       onToggleSidebar={onToggleSidebar}