Prevent Android chats from freezing or going blank (#1989)

* fix(app): stabilize streamed chat rendering

Use deterministic Markdown AST keys and preserve unique row identities when an assistant message resumes after a tool. Keep native gesture and plan-card children correctly keyed to avoid unsupported Fabric reconciliation paths.

* fix(app): stabilize retained native panels

Keep retained workspace roots in a stable native order and make active
panels present in the selection commit. Hidden panels now stop expensive
subscriptions and animations without losing mounted state.

* fix(app): harden retained panel activity

packages/app/src/components/file-pane.tsx

@@ -1,4 +1,4 @@
-import React, { useContext, useEffect, useMemo, useRef } from "react";
+import React, { useEffect, useMemo, useRef } from "react";
 import { useQuery } from "@tanstack/react-query";
 import type { FileReadResult } from "@getpaseo/client/internal/daemon-client";
 import {
@@ -29,7 +29,7 @@ import { createPreviewAttachmentId, getFileNameFromPath } from "@/attachments/ut
 import { explorerFileFromReadResult } from "@/file-explorer/read-result";
 import { resolveFilePreviewReadTarget } from "@/file-explorer/preview-target";
 import type { WorkspaceFileLocation } from "@/workspace/file-open";
-import { MountedTabActiveContext } from "@/components/split-container";
+import { useRetainedPanelActive } from "@/components/retained-panel";
 import { useAppVisible } from "@/hooks/use-app-visible";
 import { isFileQueryEnabled } from "@/components/file-pane-enabled";
 
@@ -414,7 +414,7 @@ export function FilePane({
   // Re-read the file when this pane becomes visible again (#445). `isActive`
   // covers tab switches, `isAppVisible` the whole-app background/foreground; the
   // gate itself lives in isFileQueryEnabled.
-  const isActive = useContext(MountedTabActiveContext);
+  const isActive = useRetainedPanelActive();
   const isAppVisible = useAppVisible();
 
   const query = useQuery({