chore: patch project maps for loading-overlay and orphaned session entries

- Add loading-overlay.tsx to component maps
- Remove orphaned session-progress-panel.tsx and session-operations.tsx entries
- Refresh parent indexes after manual map edits

Quality gates: pytest 313 passed/34 skipped, npm run typecheck/lint clean,
npm test -- --run 87 passed

apps/web/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: apps/web
 
 ## role
-Frontend web application providing a React-based UI with code editing, terminal, and routing capabilities for the "headquarter" project.
+Frontend web application serving as the browser-based UI for the project, built with React/Vite/TypeScript and deployed via nginx.
 ## parent
 index: apps/.pi-map.index.md
 map: apps/.pi-map.md