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/src/components/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: apps/web/src/components
 
 ## role
-Reusable React UI components and authentication guards for the web application's frontend interface.
+Provides reusable, accessible React UI components and utilities for the web application including layout shells, data display states, icon system, code editing, routing guards, and toast notification infrastructure.
 ## parent
 index: apps/web/src/.pi-map.index.md
 map: apps/web/src/.pi-map.md
@@ -15,6 +15,7 @@ map: apps/web/src/.pi-map.md
 - code-editor.tsx
 - data-states.tsx
 - icon.tsx
+- loading-overlay.tsx
 - protected-route.test.tsx
 - protected-route.tsx
 - syntax-highlighter.tsx