Revert "Aim by dragging at them, so the thumb stops walking into the iOS edge"

This reverts commit d4bbcfc080.

input.js

@@ -42,7 +42,7 @@ export function takeFlickAim(maxAgeMs = 450) {
 }
 
 // the two-stage serve: a drag that STARTS at a serveable pretoss aims a visible reticle
-// (G.aim, drawn by render); release fires the serve there, dragging home again cancels.
+// (G.aim, drawn by render); release fires the serve there, dragging back home cancels.
 // EVERY phase of splatter play, so the drag never silently turns into something else. The old
 // "drag walks the player" mode between shots was invisible state and read as a bug.
 const canAimServe = () =>
@@ -90,16 +90,10 @@ cv.addEventListener('touchmove', e => {
     if (t.identifier !== stick.id) continue;
     const dx = t.clientX - stick.x0, dy = t.clientY - stick.y0, dist = Math.hypot(dx, dy);
     if (dist > DEAD) stick.moved = true;
-    // Drag TOWARD the target, not back from it. It used to be a slingshot (pull back, launch
-    // forward) and that felt better — but every shot then ended with the thumb LOWER than it
-    // started, and the next touch begins where the last one ended. Over a horde the thumb walks
-    // itself into the iOS bottom edge and a pull becomes Reachability. Dragging at them walks it
-    // UP-screen instead, away from the edge. It also matches the flick-swing below, which always
-    // aimed this way.
-    if (stick.aimable) {
+    if (stick.aimable) { // slingshot: PULL BACK, launch forward — the shot is the inverse of the drag
       if (dist > DEAD) {
-        if (!stick.tossed) { serveToss(); stick.tossed = true; } // the drag kicks off the toss animation
-        G.aim = { fx: dx / dist, fy: dy / dist, mag: dist };
+        if (!stick.tossed) { serveToss(); stick.tossed = true; } // the pull kicks off the toss animation
+        G.aim = { fx: -dx / dist, fy: -dy / dist, mag: dist };
         // the moment the pull is strong enough to actually splatter, it clicks — you can feel
         // where the threshold is without watching the reticle
         const hot = pullQuality(dist) >= TUNE.zSplatQ;