Keep the gap blank, and give the writing more of the page

Two things wrong with the paper.

"Start writing..." was printed at the foot of every page that had a break
after it. The placeholder extension styles `[contenteditable]:empty::before`,
and the spacer holding a gap open is exactly that: empty, and not
editable. It inherited a placeholder meant for an empty note.

And the column was too narrow for the sheet it now sits on — about 73
characters, which left 117px of blank paper down each edge and made the
writing look lost. Widened to about 80, a little short of where the eye
stops reliably finding the start of the next line, which leaves roughly
8% of the sheet as margin: a document's margin rather than a picture
frame.

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

e2e/editor.mjs

@@ -211,6 +211,17 @@ try {
     (await p.locator(".ne-page-spacer").count()) > 0,
     "which takes holding the gap open inside the text itself"
   );
+  /* The placeholder extension styles `[contenteditable]:empty::before`, and a
+   * spacer is exactly that. "Start writing..." was printed at the foot of every
+   * page that had a break after it. */
+  check(
+    await p.evaluate(() =>
+      [...document.querySelectorAll(".ne-page-spacer")].every(
+        (el) => getComputedStyle(el, "::before").content === "none"
+      )
+    ),
+    "and the gap stays blank — no placeholder printed at the foot of the page"
+  );
 
   /* The note is still one document — pages are drawn, not stored. */
   const stored = (await api(p, "GET", "/notes")).body[0];