fix: set viewport-fit=cover to enable CSS env() variables in PWAs #20124

Job	Run time
build	2m 44s
unit-tests (1, flow-client,flow-server,vaadin-dev-server,flow-data,flow-bom,flow-polymer-template...	13s
it-tests (1, flow-tests/test-embedding/test-embedding-application-theme,flow-tests/test-npm-only-...	13s
it-tests (2, flow-tests/test-frontend/vite-basics,flow-tests/test-embedding/test-embedding-produc...	13s
it-tests (3, flow-tests/test-live-reload,flow-tests/test-embedding/test-embedding-generic,flow-te...	13s
it-tests (4, flow-tests/vaadin-spring-tests/test-spring-boot-only-prepare,flow-tests/vaadin-sprin...	13s
it-tests (5, flow-tests/vaadin-spring-tests/test-spring,flow-tests/vaadin-spring-tests/test-sprin...	11s
it-tests (6, flow-tests/test-eager-bootstrap,flow-tests/test-router-custom-context,flow-tests/tes...	12s
it-tests (7, flow-tests/test-pwa-disabled-offline,flow-tests/test-custom-frontend-directory/test-...	12s
it-tests (8, flow-tests/test-frontend/vite-pwa,flow-tests/test-ccdm-flow-navigation,flow-tests/te...	11s
it-tests (9, flow-tests/test-frontend/vite-pwa-disabled-offline,flow-tests/test-frontend/vite-emb...	13s
it-tests (10, flow-tests/test-pwa,flow-tests/test-dev-mode,flow-tests/test-frontend/vite-embedded...	14s
it-tests (11, flow-tests/test-redeployment,flow-tests/test-frontend/vite-embedded-webcomponent-re...	13s
it-tests (12, flow-tests/test-root-context, AbstractClientServerCounterIT,AbstractDebounceSynchro...	13s
it-tests (13, flow-tests/test-root-context, AbstractBasicElementComponentIT,AbstractContextInline...	12s
test-results	1s
	5m 41s

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