chore(release): 0.70.0 — E4 Frontend Platform (bookmarkable URLs + touch a11y)
Bump VERSION to 0.70.0 and add the user-facing release-notes entry for the E4 Frontend Platform epic: full bookmarkable/shareable address-bar URLs (retiring the "Share view" button), touch-visible card action buttons with a shape (not colour-only) watched marker, and the bookmark-page-closes-on-modal-close fix — over a large internal front-end refactor (god-component splits, usePref, useUrlMirror, FilterRail, Modal focus). No DB migration.
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