[web] Move UI scope to React states (#26403)

* Move `ui.view` to setState

* Move `openFile` to setState

* Move `ui.leftMenuShown` to setState

* Move `ui.miniReviewPanelVisible` to setState

* Move `ui.pdfLayout` to setState

* Move `ui.chatOpen` to setState

* Move `ui.reviewPanelOpen` to setState

* Cleanup: remove layout-context-adapter and imports

* Replace `ui` scope by mocked `LayoutProvider` in tests

* Update test

* Remove unnecessary `scopeStore.set('ui.chatOpen' ...`

GitOrigin-RevId: 81578bfdc958239eac492905f714a6074c81d0f5

services/web/test/frontend/features/source-editor/helpers/mock-scope.ts

@@ -81,9 +81,6 @@ export const mockScope = (
       write: true,
       ...permissions,
     },
-    ui: {
-      reviewPanelOpen: false,
-    },
     toggleReviewPanel: cy.stub(),
     toggleTrackChangesForEveryone: cy.stub(),
     refreshResolvedCommentsDropdown: cy.stub(() => sleep(1000)),