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/sections/mcp/McpPage.tsx

@@ -13,6 +13,7 @@ import {
   type McpDraft,
   type McpScope,
 } from '@/stores/useMcpConfigStore';
+import { useShallow } from 'zustand/react/shallow';
 import {
   parseImportedMcpSnippet,
   applyImportedMcpToDraft,
@@ -607,7 +608,17 @@ export const McpPage: React.FC = () => {
     createMcp,
     updateMcp,
     deleteMcp,
-  } = useMcpConfigStore();
+  } = useMcpConfigStore(useShallow((s) => ({
+    selectedMcpName: s.selectedMcpName,
+    mcpServers: s.mcpServers,
+    mcpDraft: s.mcpDraft,
+    setMcpDraft: s.setMcpDraft,
+    setSelectedMcp: s.setSelectedMcp,
+    getMcpByName: s.getMcpByName,
+    createMcp: s.createMcp,
+    updateMcp: s.updateMcp,
+    deleteMcp: s.deleteMcp,
+  })));
 
   const currentDirectory = useDirectoryStore((state) => state.currentDirectory);
   const isVSCodeAuthRuntime = React.useMemo(() => isVSCodeRuntime(), []);

packages/ui/src/components/sections/mcp/McpSidebar.tsx

@@ -10,6 +10,7 @@ import {
 } from '@/components/ui/dialog';
 import { RiAddLine, RiDeleteBinLine, RiMore2Line, RiPlugLine, RiRefreshLine, RiServerLine, RiGlobalLine } from '@remixicon/react';
 import { useMcpConfigStore, type McpDraft, type McpServerConfig } from '@/stores/useMcpConfigStore';
+import { useShallow } from 'zustand/react/shallow';
 import { useMcpStore } from '@/stores/useMcpStore';
 import { useDirectoryStore } from '@/stores/useDirectoryStore';
 import { isMobileDeviceViaCSS } from '@/lib/device';
@@ -64,7 +65,14 @@ export const McpSidebar: React.FC<McpSidebarProps> = ({ onItemSelect }) => {
   const bgClass = 'bg-background';
 
   const { mcpServers, selectedMcpName, setSelectedMcp, setMcpDraft, loadMcpConfigs, deleteMcp } =
-    useMcpConfigStore();
+    useMcpConfigStore(useShallow((s) => ({
+      mcpServers: s.mcpServers,
+      selectedMcpName: s.selectedMcpName,
+      setSelectedMcp: s.setSelectedMcp,
+      setMcpDraft: s.setMcpDraft,
+      loadMcpConfigs: s.loadMcpConfigs,
+      deleteMcp: s.deleteMcp,
+    })));
 
   const currentDirectory = useDirectoryStore((state) => state.currentDirectory);
   const mcpStatus = useMcpStore((state) => state.getStatusForDirectory(currentDirectory ?? null));