patches: review pass 3 - move block_input to origin patches

block_input protection moved from P0008 to their respective origin
patches for independent compilability (GNU Emacs requirement):
- P0001 (ns_ax_buffer_text): now has block_input + record_unwind
- P0003 (postCompletionAnnouncementForBuffer): now has block_input
- P0004 (ns_ax_scan_interactive_spans): now has block_input

P0008 now only adds its own new functionality (child frame completion
announcements, echo area announcements) without duplicating block_input
from earlier patches.

All 9 patches apply cleanly with git am on Linux git 2.43.0.

patches/0006-doc-add-VoiceOver-accessibility-section-to-macOS-app.patch

@@ -1,7 +1,7 @@
-From 8bc94f26137898cb050f176c244caa3d3a1c5946 Mon Sep 17 00:00:00 2001
+From 09e78385e7ccaf3a74d333f741f408bd2baa88f3 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
-Subject: [PATCH 7/9] doc: add VoiceOver accessibility section to macOS
+Subject: [PATCH 6/8] doc: add VoiceOver accessibility section to macOS
  appendix
 
 * doc/emacs/macos.texi (VoiceOver Accessibility): New node between
@@ -110,10 +110,10 @@ index 6bd334f48e..8d4a7825d8 100644
  @section GNUstep Support
  
 diff --git a/src/nsterm.m b/src/nsterm.m
-index 231ae95a17..062066d4e5 100644
+index 95a5b378c1..8a1bfd9eb1 100644
 --- a/src/nsterm.m
 +++ b/src/nsterm.m
-@@ -14657,9 +14657,13 @@ Nil means use fullscreen the old (< 10.7) way.  The old way works better with
+@@ -14665,9 +14665,13 @@ Nil means use fullscreen the old (< 10.7) way.  The old way works better with
  
    DEFVAR_BOOL ("ns-accessibility-enabled", ns_accessibility_enabled,
       doc: /* Non-nil enables Zoom cursor tracking and VoiceOver support.