Revert "fix(scroll): enable pixel-scroll-precision-mode for smooth macOS trackpad scrolling"

This reverts commit 372e93fce4.

config.el

@@ -180,23 +180,22 @@ Bound to cmd+v in org-mode and markdown-mode."
     (global-set-key key #'ignore))
   (setq mouse-highlight nil))
 
-;; macOS smooth scrolling — pixel-scroll-precision-mode (Emacs 29+, works on NS/Cocoa)
-;; pixel-scroll-precision-mode handles [wheel-up/down] → pixel-scroll-precision.
-;; ns-use-mwheel-momentum: macOS sends momentum-phase events after finger lift;
-;;   setting t passes them through so kinetic/inertial scrolling works.
-;; pixel-scroll-precision-use-momentum nil: let macOS handle momentum (Emacs
-;;   momentum simulation would double-apply on top of NS momentum events).
+;; macOS scroll wheel best practice (NS/Cocoa build):
+;; - pixel-scroll-precision-mode is NOT used: it targets X11/Haiku and breaks
+;;   NS/Cocoa scroll event delivery (rebinds [wheel-up/down] to non-working handlers)
+;; - Standard mwheel.el with conservative settings is reliable on macOS
+;; - NS backend converts trackpad + physical wheel to [wheel-up]/[wheel-down] events
 (when (display-graphic-p)
-  ;; NS/macOS: honour trackpad kinetic (inertial) scrolling
-  (setq ns-use-mwheel-momentum t)
-  ;; Horizontal scroll + follow-mouse still go through mwheel.el
-  (setq mouse-wheel-follow-mouse t
-        mouse-wheel-tilt-scroll  t)
-  ;; Pixel-precise vertical scrolling (Emacs 29+)
-  (when (fboundp 'pixel-scroll-precision-mode)
-    (setq pixel-scroll-precision-use-momentum nil  ; macOS provides its own momentum
-          pixel-scroll-precision-large-scroll-height 40.0)
-    (pixel-scroll-precision-mode 1)))
+  (require 'mwheel)
+  ;; 3 lines per scroll tick; shift = 1 line; no progressive acceleration
+  (setq mouse-wheel-scroll-amount    '(3 ((shift) . 1) ((meta) . 0) ((control) . text-scale))
+        mouse-wheel-progressive-speed nil   ; constant speed, no acceleration
+        mouse-wheel-follow-mouse      t     ; scroll window under cursor
+        mouse-wheel-tilt-scroll       t     ; horizontal scroll with tilt/two-finger
+        mouse-wheel-flip-direction    nil)  ; standard direction (not natural)
+  ;; Ensure mwheel-scroll is bound (Doom may remap these)
+  (global-set-key [wheel-up]   #'mwheel-scroll)
+  (global-set-key [wheel-down] #'mwheel-scroll))