patches: fix childFrameLastBuffer ivar init order

The Qnil initialization was in patch 0000 (Zoom) but the ivar
declaration is in patch 0008 (child frame tracking).  Moved the
init to patch 0008 so each patch compiles independently.

patches/0007-ns-announce-overlay-completion-candidates-for-VoiceO.patch

@@ -1,4 +1,4 @@
-From 3840a4b1e57f6fbdfc005ad86ef16bb0bfdf0868 Mon Sep 17 00:00:00 2001
+From ba3ea125d91b9e2379ce1da3b000a0896255ac50 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 14:46:25 +0100
 Subject: [PATCH 8/9] ns: announce overlay completion candidates for VoiceOver
@@ -61,7 +61,7 @@ index 6e830de..2102fb9 100644
  @property (nonatomic, assign) BOOL cachedMarkActive;
  @property (nonatomic, copy) NSString *cachedCompletionAnnouncement;
 diff --git a/src/nsterm.m b/src/nsterm.m
-index f7da553..e333d45 100644
+index c796840..f1aa0a4 100644
 --- a/src/nsterm.m
 +++ b/src/nsterm.m
 @@ -7208,11 +7208,154 @@ Accessibility virtual elements (macOS / Cocoa only)
@@ -540,7 +540,7 @@ index f7da553..e333d45 100644
     Methods are kept here (same .m file) so they access the ivars
     declared in the @interface ivar block.  */
  @implementation EmacsAccessibilityBuffer (InteractiveSpans)
-@@ -12227,7 +12473,7 @@ - (int) fullscreenState
+@@ -12224,7 +12470,7 @@ - (int) fullscreenState
  
    if (WINDOW_LEAF_P (w))
      {
@@ -549,7 +549,7 @@ index f7da553..e333d45 100644
        EmacsAccessibilityBuffer *elem
  	= [existing objectForKey:[NSValue valueWithPointer:w]];
        if (!elem)
-@@ -12261,7 +12507,7 @@ - (int) fullscreenState
+@@ -12258,7 +12504,7 @@ - (int) fullscreenState
      }
    else
      {
@@ -558,7 +558,7 @@ index f7da553..e333d45 100644
        Lisp_Object child = w->contents;
        while (!NILP (child))
  	{
-@@ -12373,7 +12619,7 @@ - (void)postAccessibilityUpdates
+@@ -12370,7 +12616,7 @@ - (void)postAccessibilityUpdates
    accessibilityUpdating = YES;
  
    /* Detect window tree change (split, delete, new buffer).  Compare
@@ -567,7 +567,7 @@ index f7da553..e333d45 100644
    Lisp_Object curRoot = FRAME_ROOT_WINDOW (emacsframe);
    if (!EQ (curRoot, lastRootWindow))
      {
-@@ -12382,12 +12628,12 @@ - (void)postAccessibilityUpdates
+@@ -12379,12 +12625,12 @@ - (void)postAccessibilityUpdates
      }
  
    /* If tree is stale, rebuild FIRST so we don't iterate freed