A poll's options are thumb-sized, and floating buttons don't fail what scrolls under them

On touch a poll's options are at least 44px tall with 8px between them, and a long option wraps. The phone sweep
ignores a probe that lands on a fixed floating control (the round New post button covers the card under it by design)
instead of failing the target for it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

tests/e2e/Mobile/fit.js

@@ -181,6 +181,15 @@ window.__fit = (() => {
 			|| el.matches("input[type=checkbox], input[type=radio]") && el.closest("label") !== null
 	}
 
+	// a control floating over the page (the round New post button) covers what scrolls under it, by design: a probe that
+	// lands on one says nothing about the target's own room
+	function floating(hit, el) {
+		for (let a = hit; a && a !== document.body; a = a.parentElement)
+			if (style(a).position === "fixed")
+				return !a.contains(el)
+		return false
+	}
+
 	// a tap at this point reaches the element: on it, inside it, on its label's control, or on a label holding it
 	function reaches(el, x, y) {
 		const hit = document.elementFromPoint(x, y)
@@ -223,8 +232,10 @@ window.__fit = (() => {
 			for (const [dx, dy, side] of [[-21, 0, "left"], [21, 0, "right"], [0, -21, "up"], [0, 21, "down"]]) {
 				const px = Math.min(clip.right - 1, Math.max(clip.left, x + dx)), py = Math.min(clip.bottom - 1, Math.max(clip.top, y + dy))
 				if (!reaches(el, px, py)) {
-					failed.push(side)
 					const other = document.elementFromPoint(px, py)
+					if (other && floating(other, el))
+						continue
+					failed.push(side)
 					hit[side] = other ? name(other) : null
 				}
 			}