feat(web): node palette with search and drag&drop (E4-T3)

refactor(web): address palette review feedback (E4-T3)

feat(web): node palette with search and drag&drop (E4-T3)

feat(web): workflow canvas with React Flow and graph mapper (E4-T2)

refactor(web): address review nits — drop redundant casts, rename onConnect to connectEdge (E4-T2)

test(web): hints bar overflow counter coverage (E4-T2 review)

test(web): editor page coverage and store/page edge cases (E4-T2 review)

feat(web): projects list/create and project page with workflows (E4-T1 navigation gap)

feat(web): workflow canvas with React Flow and graph mapper (E4-T2)

refactor(web): remove Playwright e2e per ADR-020 and clean auth navigation

fix(web): avoid returnTo query on user logout and expand e2e smoke tests

feat(web): E4-T1 auth SPA foundation with API client, auth shell, workspace provider and e2e smoke tests

docs: e4