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/electron/main.mjs

@@ -707,6 +707,8 @@ const loadShellEnv = () => {
 };
 
 // Merge the user's login-shell env (PATH, etc.) into this process before we
+import { pathLooksUserConfigured, mergePathValues } from '@openchamber/web/server/lib/opencode/path-utils.js';
+
 // import/start the server in-process. The server and its children (opencode
 // CLI, git, etc.) inherit process.env directly now — there is no sidecar
 // subprocess to hand a custom env to.
@@ -716,13 +718,7 @@ const inheritUserShellEnv = () => {
 
   const homeDir = os.homedir();
   const currentPath = process.env.PATH || '';
-  const currentPathLooksUserConfigured = currentPath.split(':').some((segment) => (
-    segment.startsWith(`${homeDir}${path.sep}`)
-    || segment === homeDir
-    || segment.startsWith('/opt/homebrew/')
-    || segment.startsWith('/opt/pkg/')
-    || segment.startsWith('/opt/pmk/')
-  ));
+  const currentPathLooksUserConfigured = pathLooksUserConfigured(currentPath, homeDir, ':');
 
   for (const [key, value] of Object.entries(shellEnv)) {
     if (key === 'PATH') continue;
@@ -730,8 +726,10 @@ const inheritUserShellEnv = () => {
       process.env[key] = value;
     }
   }
-  if (!currentPathLooksUserConfigured && typeof shellEnv.PATH === 'string' && shellEnv.PATH.length > 0) {
-    process.env.PATH = shellEnv.PATH;
+
+  const shellPath = typeof shellEnv.PATH === 'string' ? shellEnv.PATH : '';
+  if (!currentPathLooksUserConfigured && shellPath) {
+    process.env.PATH = mergePathValues(shellPath, currentPath, ':');
   }
 };