perf: reduce re-renders, fix mobile keyboard handling, add chunk load recovery, and improve PATH management (#1028)

* fix: exclude file content from reverted prompt text

Revert and fork now restore only the user's original prompt, not server-injected file content
Uses existing isSyntheticPart helper for type-safe filtering

* fix: keep scrollbar visible when hovering over thumb

* fix: prevent ESC abort from triggering when terminal is focused

* fix: pass directory to permission/question reply calls so approvals actually resolve

* fix: default model selection not responding after Base UI migration

* fix: prevent modal content from shifting and clipping footer buttons

* fix: improve session switching performance and add sub-agent export with prompt collapse

Defer viewport anchor saving to eliminate ~800ms UI freeze when switching sessions
Add export dialog to include sub-agent tasks recursively in markdown export
Add collapse chevron button for expanded user prompts in sticky header

* fix: resolve sidebar scroll and TDZ crash in session sidebar

* perf: reduce CPU overhead and re-renders across chat, layout, and settings

* fix: position collapse button at top of message and prevent ESC abort in terminal

* fix: position collapse button at top and add padding only when expanded

* refactor: extract shared PATH utilities and mobile keyboard hook

* refactor: import shared path-utils in electron, use module-level style constants

- Electron now imports pathLooksUserConfigured/mergePathValues from
  shared path-utils.js instead of inline duplication
- ToolPart collapsedCustomStyle moved from useMemo([]) to module const

* fix: resolve remaining merge conflicts and type errors

- Remove duplicate variable declarations in SessionNodeItem
- Remove orphaned export callback body from conflict resolution
- Fix HelpDialog description -> descriptionKey (i18n rename)

* fix: resolve type-check and lint errors in session-actions.test.ts

- Added missing bun:test type declarations (beforeEach, mock, mock.module)
- Removed unused State import
- Replaced 'as any' casts with proper OpencodeClient and ChildStoreManager types
- Added eslint-disable for unused _ parameter in mock function

* fix PR 1028 export and PATH edge cases

* fix startup retry exhaustion state

* remove opencode package lock change

* fix sub-session rename cancellation

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/components/layout/SidebarFilesTree.tsx

@@ -374,6 +374,11 @@ export const SidebarFilesTree: React.FC = () => {
   const canDelete = Boolean(files.delete);
   const canReveal = Boolean(files.revealPath);
 
+  const fileRowPermissions = React.useMemo(
+    () => ({ canRename, canCreateFile, canCreateFolder, canDelete, canReveal }),
+    [canRename, canCreateFile, canCreateFolder, canDelete, canReveal]
+  );
+
   const handleRevealPath = React.useCallback((targetPath: string) => {
     if (!files.revealPath) return;
     void files.revealPath(targetPath).catch(() => {
@@ -787,7 +792,7 @@ export const SidebarFilesTree: React.FC = () => {
             isActive={isActive}
             status={!isDir ? getFileStatus(node.path) : undefined}
             badge={isDir ? getFolderBadge(node.path) : undefined}
-            permissions={{ canRename, canCreateFile, canCreateFolder, canDelete, canReveal }}
+            permissions={fileRowPermissions}
             downloadFile={files.downloadFile}
             contextMenuPath={contextMenuPath}
             setContextMenuPath={setContextMenuPath}