feat(app): retain Explorer across layout and appearance changes

Keep one workspace Explorer host and destination-aware navigation so folding, theme updates and compact sheets preserve the current panel. Scope pull request discovery and timeline demand to active surfaces.

packages/app/src/git/diff-pane.tsx

@@ -1427,10 +1427,9 @@ function useDiffTabNavigation({
     openWorkspacePullRequest({
       isCompact: isMobile,
       workspaceKey: persistenceKey,
-      checkout: { serverId, cwd, isGit: true },
       destination: pullRequestOpenLocation,
     });
-  }, [cwd, isMobile, persistenceKey, pullRequestOpenLocation, serverId]);
+  }, [isMobile, persistenceKey, pullRequestOpenLocation]);
   return {
     openDiff,
     openCommit,

packages/app/src/git/pull-request-connection.tsx

@@ -0,0 +1,27 @@
+import { createContext, useContext, type ReactNode } from "react";
+import type { DaemonClient } from "@getpaseo/client/internal/daemon-client";
+import { useHostRuntimeClient, useHostRuntimeIsConnected } from "@/runtime/host-runtime";
+
+export interface PullRequestConnection {
+  client: Pick<DaemonClient, "checkoutPrStatus" | "pullRequestTimeline"> | null;
+  isConnected: boolean;
+}
+const ConnectionContext = createContext<((serverId: string) => PullRequestConnection) | null>(null);
+
+/** Supplies the PR read connection, shared by discovery, rail status and timeline content. */
+export function PullRequestConnectionProvider({
+  connection,
+  children,
+}: {
+  connection: (serverId: string) => PullRequestConnection;
+  children: ReactNode;
+}) {
+  return <ConnectionContext value={connection}>{children}</ConnectionContext>;
+}
+
+export function usePullRequestConnection(serverId: string): PullRequestConnection {
+  const supplied = useContext(ConnectionContext);
+  const client = useHostRuntimeClient(serverId);
+  const isConnected = useHostRuntimeIsConnected(serverId);
+  return supplied ? supplied(serverId) : { client, isConnected };
+}

packages/app/src/git/pull-request-panel/use-data.test.ts

@@ -406,7 +406,7 @@ describe("selectPrPaneState", () => {
     expect(state.data?.forgeSpecific).toEqual({ ...gitlabFacts, mergeStatus: null });
   });
 
-  it("returns null data when the consumer disabled timeline rendering", () => {
+  it("keeps cached content when retained activity disables timeline demand", () => {
     const state = selectPrPaneState({
       ...baseSelectInput,
       status: prStatus(),
@@ -414,7 +414,7 @@ describe("selectPrPaneState", () => {
       timelinePayload: timelinePayload(),
     });
 
-    expect(state.data).toBeNull();
+    expect(state.data).not.toBeNull();
     expect(state.prNumber).toBe(42);
   });
 

packages/app/src/git/pull-request-panel/use-data.ts

@@ -1,7 +1,7 @@
 import { keepPreviousData, useQuery } from "@tanstack/react-query";
 import { useMemo } from "react";
 import { useTranslation } from "react-i18next";
-import { useHostRuntimeClient, useHostRuntimeIsConnected } from "@/runtime/host-runtime";
+import { usePullRequestConnection } from "@/git/pull-request-connection";
 import type {
   CheckoutPrStatusResponse,
   PullRequestTimelineResponse,
@@ -20,7 +20,7 @@ type PullRequestTimeline = PullRequestTimelineResponse["payload"];
 export interface UsePrPaneDataOptions {
   serverId: string;
   cwd: string;
-  enabled?: boolean;
+  enabled: boolean;
   timelineEnabled?: boolean;
 }
 
@@ -166,7 +166,7 @@ export interface SelectPrPaneStateInput {
 export function selectPrPaneState(input: SelectPrPaneStateInput): UsePrPaneDataResult {
   const identity = extractPrRepoIdentity(input.status);
   const data =
-    identity.prNumber === null || !input.timelineEnabled
+    identity.prNumber === null
       ? null
       : mapPrPaneData(input.status, input.timelinePayload, undefined, input.forge ?? "github");
   const statusRefreshing = input.statusIsFetching && !input.statusIsLoading;
@@ -198,12 +198,11 @@ export function selectPrPaneState(input: SelectPrPaneStateInput): UsePrPaneDataR
 export function usePrPaneData({
   serverId,
   cwd,
-  enabled = true,
+  enabled,
   timelineEnabled = enabled,
 }: UsePrPaneDataOptions): UsePrPaneDataResult {
   const { t } = useTranslation();
-  const daemonClient = useHostRuntimeClient(serverId);
-  const isConnected = useHostRuntimeIsConnected(serverId);
+  const { client: daemonClient, isConnected } = usePullRequestConnection(serverId);
   const checkoutPrStatus = useCheckoutPrStatusQuery({ serverId, cwd, enabled });
   const status = checkoutPrStatus.status;
   const identity = extractPrRepoIdentity(status);

packages/app/src/git/use-pr-status-query.ts

@@ -1,6 +1,6 @@
 import { useQuery } from "@tanstack/react-query";
 import { useTranslation } from "react-i18next";
-import { useHostRuntimeClient, useHostRuntimeIsConnected } from "@/runtime/host-runtime";
+import { usePullRequestConnection } from "@/git/pull-request-connection";
 import { checkoutPrStatusQueryKey } from "@/git/query-keys";
 import { normalizeForge } from "@/git/forge";
 import { selectPrHintFromStatus, type PrHint } from "@/git/pr-hint";
@@ -25,8 +25,7 @@ export function useCheckoutPrStatusQuery({
   enabled = true,
 }: UseCheckoutPrStatusQueryOptions) {
   const { t } = useTranslation();
-  const client = useHostRuntimeClient(serverId);
-  const isConnected = useHostRuntimeIsConnected(serverId);
+  const { client, isConnected } = usePullRequestConnection(serverId);
 
   const query = useQuery({
     queryKey: checkoutPrStatusQueryKey(serverId, cwd),
@@ -67,8 +66,7 @@ export function useWorkspacePrHint({
   enabled = true,
 }: UseCheckoutPrStatusQueryOptions): PrHint | null {
   const { t } = useTranslation();
-  const client = useHostRuntimeClient(serverId);
-  const isConnected = useHostRuntimeIsConnected(serverId);
+  const { client, isConnected } = usePullRequestConnection(serverId);
 
   const query = useQuery<CheckoutPrStatusPayload, Error, PrHint | null>({
     queryKey: checkoutPrStatusQueryKey(serverId, cwd),