Ilia Denisov
6d263ff7c6
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Replace the 24px edge-swipe with a router-level interactive back gesture: a rightward drag in the left ~38% band tracks the finger while a cheap themed backdrop parallaxes in, and on release commits the back-navigation (past ~40% of the width or a rightward flick) or snaps back. The live parent mounts only on commit, which suppresses that one route slide for a seamless hand-off. Pure decision logic (shouldArm/lockAxis/decideCommit + the per-gesture controller) lives in lib/backswipe.ts with unit tests; the DOM wiring, hit-test and settle animation in lib/backswipe.svelte.ts. The gesture yields to native vertical scroll, skips the rack / draggable pending tiles / text inputs / the board while zoomed-in, and is disabled inside Telegram (native BackButton owns it). parentPath in App.svelte is now the single source for both the Telegram button and the swipe. Tests: backswipe unit (13) + e2e (3; Chromium+WebKit: commit, zoomed-in skip, vertical scroll). Docs: UI_DESIGN.md Back bullet.