feat(app): /new-session route for new design (#31457)

packages/app/src/app.tsx

@@ -9,7 +9,7 @@ import { Font } from "@opencode-ai/ui/font"
 import { Splash } from "@opencode-ai/ui/logo"
 import { ThemeProvider } from "@opencode-ai/ui/theme/context"
 import { MetaProvider } from "@solidjs/meta"
-import { type BaseRouterProps, Navigate, Route, Router } from "@solidjs/router"
+import { type BaseRouterProps, Navigate, Route, Router, useParams, useSearchParams } from "@solidjs/router"
 import { QueryClient, QueryClientProvider } from "@tanstack/solid-query"
 import { Effect } from "effect"
 import {
@@ -43,25 +43,88 @@ import { PromptProvider } from "@/context/prompt"
 import { ServerConnection, ServerProvider, serverName, useServer } from "@/context/server"
 import { SettingsProvider, useSettings } from "@/context/settings"
 import { TerminalProvider } from "@/context/terminal"
-import { TabsProvider } from "@/context/tabs"
+import { TabsProvider, useTabs, type DraftTab } from "@/context/tabs"
+import { SDKProvider, useSDK } from "@/context/sdk"
 import { WslServersProvider } from "@/wsl/context"
-import DirectoryLayout from "@/pages/directory-layout"
+import DirectoryLayout, { DirectoryDataProvider } from "@/pages/directory-layout"
 import Layout from "@/pages/layout"
 import { ErrorPage } from "./pages/error"
 import { useCheckServerHealth } from "./utils/server-health"
 
 const HomeRoute = lazy(() => import("@/pages/home"))
 const Session = lazy(() => import("@/pages/session"))
+const NewSession = lazy(() => import("@/pages/new-session"))
 
 const SessionRoute = Object.assign(
-  () => (
-    <SessionProviders>
-      <Session />
-    </SessionProviders>
-  ),
+  () => {
+    const settings = useSettings()
+    const params = useParams()
+    const [search] = useSearchParams<{ draftId?: string; prompt?: string }>()
+    const sdk = useSDK()
+    const server = useServer()
+    const tabs = useTabs()
+
+    // When the new layout is enabled, the legacy new-session route (/:dir/session with no id)
+    // is replaced by a draft at /new-session?draftId=…
+    createEffect(() => {
+      if (!settings.general.newLayoutDesigns()) return
+      if (params.id || search.draftId) return
+      if (!tabs.ready() || !sdk.directory) return
+      tabs.newDraft({ server: server.key, directory: sdk.directory }, search.prompt)
+    })
+
+    return (
+      <SessionProviders>
+        <Session />
+      </SessionProviders>
+    )
+  },
   { preload: Session.preload },
 )
 
+function DraftRoute() {
+  const [search] = useSearchParams<{ draftId?: string }>()
+  const tabs = useTabs()
+  return (
+    <Show when={tabs.ready()}>
+      <Show when={search.draftId} keyed fallback={<Navigate href="/" />}>
+        {(draftID) => <ResolvedDraftRoute draftID={draftID} />}
+      </Show>
+    </Show>
+  )
+}
+
+function ResolvedDraftRoute(props: { draftID: string }) {
+  const server = useServer()
+  const tabs = useTabs()
+  const draft = createMemo(() =>
+    tabs.store.find((tab): tab is DraftTab => tab.type === "draft" && tab.draftID === props.draftID),
+  )
+
+  createEffect(() => {
+    const current = draft()
+    if (current && current.server !== server.key) server.setActive(current.server)
+  })
+
+  // Key on the directory so retargeting the draft's project re-instantiates the
+  // SDK/data providers for the new directory while keeping the same draft id.
+  const directory = () => draft()?.directory
+
+  return (
+    <Show when={directory()} keyed>
+      {(dir) => (
+        <SDKProvider directory={dir}>
+          <DirectoryDataProvider directory={dir} draftID={props.draftID}>
+            <DraftProviders>
+              <NewSession />
+            </DraftProviders>
+          </DirectoryDataProvider>
+        </SDKProvider>
+      )}
+    </Show>
+  )
+}
+
 function UiI18nBridge(props: ParentProps) {
   const language = useLanguage()
   return <I18nProvider value={{ locale: language.intl, t: language.t }}>{props.children}</I18nProvider>
@@ -141,6 +204,18 @@ function SessionProviders(props: ParentProps) {
   )
 }
 
+// The draft page only renders the prompt composer, so it drops TerminalProvider.
+// FileProvider and CommentsProvider stay because PromptInput uses file search and comment context.
+function DraftProviders(props: ParentProps) {
+  return (
+    <FileProvider>
+      <PromptProvider>
+        <CommentsProvider>{props.children}</CommentsProvider>
+      </PromptProvider>
+    </FileProvider>
+  )
+}
+
 function RouterRoot(props: ParentProps<{ appChildren?: JSX.Element }>) {
   return (
     <AppShellProviders>
@@ -335,6 +410,7 @@ export function AppInterface(props: {
             )}
           >
             <Route path="/" component={HomeRoute} />
+            <Route path="/new-session" component={DraftRoute} />
             <Route path="/:dir" component={DirectoryLayout}>
               <Route path="/" component={() => <Navigate href="session" />} />
               <Route path="/session/:id?" component={SessionRoute} />