Parsing test menus and application notifications could appear behind modal overlays or become unreachable while the background was inert. Share a stable top-layer portal that belongs to the owning or active modal, preserving notification timers, keyboard navigation and focus restoration.
Add unit and Electron regression coverage for settings, nested parsing results, application center, inference monitoring and native dialogs, with matching UI guidance and validation evidence.
Validation recorded in the preceding implementation: 4,793 tests passed and 67 skipped; typecheck, lint, isolated production build and Electron UI checks passed. Staged diff whitespace checks passed before this commit.
Release note: Menus and notifications remain visible and usable while settings or other dialogs are open, including keyboard navigation and notification dismissal.
