Clarify AppHost/App naming

[benvinegar]

Summary

• rename the inner UI component from AppShell to App
• rename the outer lifecycle wrapper from App to AppHost
• rename resetShell to resetApp and update related comments/tests for terminology consistency
• update main entrypoint, tests, and benchmarks to use the new naming

Testing

• bun run typecheck
• bun test test/ui-lib.test.ts test/app-responsive.test.tsx

[greptile-apps]

Greptile Summary

This PR is a pure naming refactor across 16 files, clarifying the roles of two components in src/ui/App.tsx: the inner UI component is renamed from AppShell → App, and the exported lifecycle/session-management wrapper is renamed from App → AppHost. The accompanying option resetShell → resetApp and state variable shellVersion → appVersion are updated consistently, along with JSDoc comments throughout the library files and all test/benchmark usages.

Key changes:

• AppShell (internal layout component) → App
• App (exported session lifecycle wrapper) → AppHost
• resetShell option and shellVersion state → resetApp / appVersion
• All imports in src/main.tsx, benchmarks, and 6 test files updated to AppHost
• JSDocs in appMenus.ts, files.ts, responsive.ts, sidebar.ts, and ModalFrame.tsx updated to remove "shell" terminology

The rename is exhaustive — a search for any remaining AppShell, resetShell, or shellVersion symbols returns no matches. No functional logic was changed.

Confidence Score: 5/5

Safe to merge — this is a pure rename with no functional changes and all references are consistently updated.

Every usage of the old names (App, AppShell, resetShell, shellVersion) has been updated across all 16 affected files, including source, tests, and benchmarks. No old symbols remain in the codebase, and no logic was altered.

No files require special attention.

Important Files Changed

Filename	Overview
src/ui/App.tsx	Core rename: AppShell → App (internal component), App → AppHost (exported wrapper), resetShell → resetApp, shellVersion → appVersion; all changes are consistent and no old symbols remain.
src/main.tsx	Import and JSX usage updated from App to AppHost; entrypoint correctly reflects the new exported name.
src/ui/hooks/useHunkSessionBridge.ts	Callback option type updated from resetShell to resetApp to match the renamed option in AppHost.reloadSession.
test/app-interactions.test.tsx	All imports and JSX usages of App updated to AppHost; test descriptions updated; no functional test logic changed.
test/app-responsive.test.tsx	App → AppHost import and usage; describe('responsive shell', ...) renamed to describe('responsive app', ...).
benchmarks/large-stream.ts	Import and three React.createElement calls updated from App to AppHost; no functional changes.

_{Reviews (1): Last reviewed commit: "Clarify AppHost/App naming" | Re-trigger Greptile}