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/lib/desktopBoot.test.ts

@@ -69,7 +69,7 @@ describe('resolveDesktopBootView', () => {
         isDesktopShell: true,
         bootOutcome: { target: 'local', status: 'unreachable' },
       }),
-    ).toEqual({ screen: 'recovery', variant: 'local-unreachable' });
+    ).toEqual({ screen: 'recovery', variant: 'local-unavailable' });
   });
 
   test('returns recovery view for remote missing', () => {
@@ -257,9 +257,9 @@ describe('getInjectedBootOutcome', () => {
 
   test('returns valid outcome for well-formed main-local', () => {
     const w = mockWindow();
-    w.__OPENCHAMBER_DESKTOP_BOOT_OUTCOME__ = { kind: 'main-local' };
+    w.__OPENCHAMBER_DESKTOP_BOOT_OUTCOME__ = { target: 'local', status: 'ok' };
     try {
-      expect(getInjectedBootOutcome()).toEqual({ kind: 'main-local' });
+      expect(getInjectedBootOutcome()).toEqual({ target: 'local', status: 'ok' });
     } finally {
       restoreWindow();
     }
@@ -339,7 +339,7 @@ describe('getBootInjectionStatus', () => {
 
   test('returns "valid" when global is present and well-formed', () => {
     const w = mockWindow();
-    w.__OPENCHAMBER_DESKTOP_BOOT_OUTCOME__ = { kind: 'main-local' };
+    w.__OPENCHAMBER_DESKTOP_BOOT_OUTCOME__ = { target: 'local', status: 'ok' };
     try {
       expect(getBootInjectionStatus()).toBe('valid');
     } finally {