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/web/server/lib/opencode/env-runtime.js

@@ -2,6 +2,7 @@ import { spawnSync } from 'node:child_process';
 import fs from 'node:fs';
 import os from 'node:os';
 import path from 'node:path';
+import { pathLooksUserConfigured, mergePathValues } from './path-utils.js';
 
 export const createOpenCodeEnvRuntime = (deps) => {
   const {
@@ -162,21 +163,6 @@ export const createOpenCodeEnvRuntime = (deps) => {
     return null;
   };
 
-  const pathLooksUserConfigured = (value) => {
-    if (typeof value !== 'string' || !value) {
-      return false;
-    }
-
-    const home = os.homedir();
-    return value.split(path.delimiter).some((segment) => (
-      segment.startsWith(home + path.sep)
-      || segment === home
-      || segment.startsWith('/opt/homebrew/')
-      || segment.startsWith('/opt/pkg/')
-      || segment.startsWith('/opt/pmk/')
-    ));
-  };
-
   const applyLoginShellEnvSnapshot = () => {
     const snapshot = getLoginShellEnvSnapshot();
     if (!snapshot) {
@@ -197,8 +183,9 @@ export const createOpenCodeEnvRuntime = (deps) => {
 
     const currentPath = process.env.PATH || '';
     const shellPath = snapshot.PATH || '';
-    if (!pathLooksUserConfigured(currentPath) && shellPath) {
-      process.env.PATH = shellPath;
+    const home = os.homedir();
+    if (!pathLooksUserConfigured(currentPath, home, path.delimiter) && shellPath) {
+      process.env.PATH = mergePathValues(shellPath, currentPath, path.delimiter);
     }
   };