Ctrl and the wheel over a PDF

The same gesture Aether has, whose comment already claimed InkNote had it.
Registered by hand rather than through onWheel, because React attaches wheel
listeners passively and a passive listener may not call preventDefault —
without which the browser zooms the whole application instead of the
document.

What stays still depends on how the zoom was asked for, and the two answers
differ: the wheel holds the point under the pointer, the buttons hold the
page being read. The buttons held nothing at all before, so three presses of
+ left you somewhere else in the file; that came out of building this and is
fixed with it.

The checks are the step, that the default really was prevented, and that a
point measured on the page is still under the pointer afterwards.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -40,6 +40,31 @@ a rebuild is not bit-identical.
 
 ---
 
+## 2026-08-22 — Ctrl and the wheel over a PDF
+
+**Images** — web `sha256:783ccf92…`, server `sha256:2141f145…`
+
+No backend source changed this round; the server digest moved only because
+`build.sh` builds both and a rebuild is not bit-identical.
+
+**Added**
+- **Ctrl (or ⌘) and the wheel zoom the document**, as in every other viewer, and
+  a trackpad pinch with it — it arrives as the same event. The listener is
+  registered by hand rather than through `onWheel`: React attaches wheel
+  listeners passively, a passive listener may not call `preventDefault`, and
+  without that the *browser* zooms the whole application instead, toolbar and
+  all. **The point under the pointer stays under the pointer**: you are pointing
+  at a word and asking for that to grow, not to be sent to the top of the page.
+
+**Fixed**
+- **Zooming with the buttons drifted.** A zoom changes how tall the document is,
+  so the scroll position means something else afterwards, and nothing was holding
+  anything still — three presses of + and you were elsewhere in the file. They
+  hold the page being read now, which is what "show me this page larger" asks
+  for.
+
+---
+
 ## 2026-08-22 — A bigger face, and the theme where the settings are
 
 **Images** — web `sha256:fe35b0e7…`, server `sha256:a557fb4d…`