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/chat/message/parts/ProgressiveGroup.tsx

@@ -738,10 +738,10 @@ export const StaticToolRow = React.memo(StaticToolRowInner, (prev, next) => {
 /**
  * Inline reasoning text block — rendered as dimmed italic markdown.
  */
-const InlineReasoningBlock: React.FC<{
+const InlineReasoningBlock = React.memo(({ activity, onContentChange }: {
     activity: TurnActivityPart;
     onContentChange?: (reason?: ContentChangeReason) => void;
-}> = ({ activity, onContentChange }) => {
+}) => {
     return (
         <ReasoningPart
             part={activity.part}
@@ -749,15 +749,15 @@ const InlineReasoningBlock: React.FC<{
             onContentChange={onContentChange}
         />
     );
-};
+});
 
 /**
  * Inline justification text block — rendered as normal assistant text between tools.
  */
-const InlineJustificationBlock: React.FC<{
+const InlineJustificationBlock = React.memo(({ activity, onContentChange }: {
     activity: TurnActivityPart;
     onContentChange?: (reason?: ContentChangeReason) => void;
-}> = ({ activity, onContentChange }) => {
+}) => {
     return (
         <JustificationBlock
             part={activity.part}
@@ -765,7 +765,7 @@ const InlineJustificationBlock: React.FC<{
             onContentChange={onContentChange}
         />
     );
-};
+});
 
 const ProgressiveGroup: React.FC<ProgressiveGroupProps> = ({
     parts,