The 7px edge tab is well below a usable touch target on a phone. This widens
only its *hit* area — the visible sliver still measures exactly 7 × 44 and
`offsetWidth`/`offsetHeight` still report it, so `placeFab`, `applyFabPos` and
the edge-snap maths are untouched.
- An invisible `#hit` child extends the tappable box inward to `28 × 72`.
`overflow: hidden` had to go (it would clip `#hit`), so the rounded-corner
clip for the dwell-progress fill moves onto `#fill` via `border-radius: inherit`.
- `touch-action` is resolved by the browser at gesture start, so the strip
cannot be both browser-scrolled and script-dragged. `#fab` keeps
`touch-action: none`, owns every gesture, and `makeDraggable` splits by
intent: a plain swipe from `#hit` scrolls the page via `window.scrollBy`, a
~400ms hold arms a reposition drag (tab brightens and grows a ring), and the
visible sliver still drags immediately with no hold.
- Adds the previously missing `pointercancel` reset, and snaps + saves on
cancel so an OS-claimed gesture (Android's swipe-back starts in exactly this
screen region) cannot strand the tab mid-screen.
- Clears a stale `dataset.dragged` on pointerdown, so a scroll or drag that
produces no trailing click cannot swallow the *next* tap.
## Testing
`node --check` clean, `node --test userscript/test/logic.test.js` 14/14 pass.
The gesture code has no unit test — `logic.test.js` runs under node with no DOM
and this branch deliberately does not add a DOM harness. Manual device checks
(tap / swipe-to-scroll / hold-to-arm / sliver-drag on a chapter page) are the
real verification and are pending.
## Known ceilings
- The scroll is hand-rolled: no momentum or fling, and it assumes the document
is the scroller rather than a nested container. Flagged in a `ponytail:`
comment with the upgrade path.
- Gesture state is not keyed by `pointerId`, so a second finger corrupts an
in-progress gesture. Pre-existing, not a regression.
- A >400ms still press on the *visible* sliver shows the armed ring even though
the sliver never needs a hold. Cosmetic only.
Reviewed-on: #9
Co-authored-by: Sulthan Zaki <sultankiki05@gmail.com>
Co-committed-by: Sulthan Zaki <sultankiki05@gmail.com>
sulthan
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