patches: fix singleLineMove compile error - out-of-scope variables

oldLine and newLine were declared inside 'if (cachedText && oldPoint > 0)'
block but singleLineMove block referenced them from outside that scope.

Fix: declare singleLineMove = NO before the granularity detection block;
compute adjFwd/adjBwd inside the 'if (oldLine.location != newLine.location)'
branch where both variables are in scope.

patches/0004-ns-add-interactive-span-elements-for-Tab-navigation.patch

@@ -1,4 +1,4 @@
-From de1a3e8c2cbc4e90d3d9f24378fa00716e1ee175 Mon Sep 17 00:00:00 2001
+From 04edba6e94622176c9869ba2564cd4fda4d2edd8 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
 Subject: [PATCH 4/8] ns: add interactive span elements for Tab navigation