Rewrites 7 spec files to use DSL helpers throughout — zero raw
page.locator/getByText/getByTestId in test() bodies. Adds 30+ new
helper primitives across 7 existing helper modules.
Adds a `withWorkspace` Playwright fixture plus composable helpers
(permissions, sidebar, composer, agent-stream, settings) so specs read
as user-level intent. Migrates workspace-lifecycle and settings-host-page
to the new DSL as proof.
Mohamed Boudra