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/agents/AgentsSidebar.tsx

@@ -19,6 +19,7 @@ import {
 } from '@/components/ui/dropdown-menu';
 import { RiAddLine, RiAiAgentFill, RiAiAgentLine, RiDeleteBinLine, RiFileCopyLine, RiMore2Line, RiRobot2Line, RiRobotLine, RiRestartLine, RiEditLine } from '@remixicon/react';
 import { useAgentsStore, isAgentBuiltIn, isAgentHidden, type AgentScope, type AgentDraft } from '@/stores/useAgentsStore';
+import { useShallow } from 'zustand/react/shallow';
 import { cn } from '@/lib/utils';
 import type { Agent } from '@opencode-ai/sdk/v2';
 import { ScrollableOverlay } from '@/components/ui/ScrollableOverlay';
@@ -116,7 +117,15 @@ export const AgentsSidebar: React.FC<AgentsSidebarProps> = ({ onItemSelect }) =>
     createAgent,
     deleteAgent,
     loadAgents,
-  } = useAgentsStore();
+  } = useAgentsStore(useShallow((s) => ({
+    selectedAgentName: s.selectedAgentName,
+    agents: s.agents,
+    setSelectedAgent: s.setSelectedAgent,
+    setAgentDraft: s.setAgentDraft,
+    createAgent: s.createAgent,
+    deleteAgent: s.deleteAgent,
+    loadAgents: s.loadAgents,
+  })));
 
   React.useEffect(() => {
     loadAgents();