patches: fix all review issues from Opus core maintainer review

BLOCKERS fixed:
- #1: add missing skip_overlay_scan: label (goto without target)
- #2: move accessibilityLineForIndex: to patch 0002 (used in 0002/0003,
  was defined in 0007 — forward reference crash risk)
- #3: move BOOL singleLineMove to patch 0008 (declared in 0007, unused
  until 0008 — -Werror build failure)

WARNINGS fixed:
- #1: block_input ordering at 5 sites (record_unwind_protect_void must
  come AFTER block_input to avoid unmatched unblock_input on error)
- #2: deduplicate ns_ax_face_is_selected (move to patch 0001, remove
  from patch 0007 where it was duplicated)
- #4: improve childFrameLastBuffer comment (document rename edge case)
- #5: complete ChangeLog for patch 0007 (add 3 missing method entries)
- #6: document lastSelectedWindow/lastRootWindow GC safety in nsterm.h

MINOR fixed:
- #2: wrap ns_zoom_track_completion call in MAC_OS_X_VERSION >= 101000
  guard (consistent with the function definition)
- #3: @cindex Zoom verified present in VoiceOver section (already OK)
- #4: raise line_starts/line_ends bound from 128 to 512 (consistent
  with ns_ax_selected_overlay_text)
- #5: add echo_area_buffer[] lifetime comment referencing xdisp.c

All 9 patches apply cleanly (git apply verified sequentially).

patches/0001-ns-add-accessibility-base-classes-and-text-extractio.patch

@@ -1,4 +1,4 @@
-From 488b91178be9a2dfd022533fce6b4adcd5c2ead0 Mon Sep 17 00:00:00 2001
+From 29546d323559dbbefd846f7b2720285ff90368c8 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
 Subject: [PATCH 2/9] ns: add accessibility base classes and text extraction
@@ -28,9 +28,9 @@ rect via glyph matrix.
 ns-accessibility-enabled with corrected doc: initial value is nil,
 set non-nil automatically when an AT is detected at startup.
 ---
- src/nsterm.h | 131 +++++++++++++++
- src/nsterm.m | 454 +++++++++++++++++++++++++++++++++++++++++++++++++++
- 2 files changed, 585 insertions(+)
+ src/nsterm.h | 131 ++++++++++++++
+ src/nsterm.m | 482 +++++++++++++++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 613 insertions(+)
 
 diff --git a/src/nsterm.h b/src/nsterm.h
 index ea6e7ba4f5..f245675513 100644
@@ -189,7 +189,7 @@ index ea6e7ba4f5..f245675513 100644
  
  
 diff --git a/src/nsterm.m b/src/nsterm.m
-index 88c9251c18..9d36de66f9 100644
+index 88c9251c18..3b923ee5fa 100644
 --- a/src/nsterm.m
 +++ b/src/nsterm.m
 @@ -46,6 +46,7 @@ Updated by Christian Limpach (chris@nice.ch)
@@ -200,7 +200,7 @@ index 88c9251c18..9d36de66f9 100644
  #include "systime.h"
  #include "character.h"
  #include "xwidget.h"
-@@ -7201,6 +7202,432 @@ - (BOOL)fulfillService: (NSString *)name withArg: (NSString *)arg
+@@ -7201,6 +7202,460 @@ - (BOOL)fulfillService: (NSString *)name withArg: (NSString *)arg
  }
  #endif
  
@@ -249,8 +249,11 @@ index 88c9251c18..9d36de66f9 100644
 +
 +  specpdl_ref count = SPECPDL_INDEX ();
 +  record_unwind_current_buffer ();
-+  record_unwind_protect_void (unblock_input);
++  /* block_input must come before record_unwind_protect_void (unblock_input):
++     if specpdl_push were to fail after registration, the unwind handler
++     would call unblock_input without a matching block_input.  */
 +  block_input ();
++  record_unwind_protect_void (unblock_input);
 +  if (b != current_buffer)
 +    set_buffer_internal_1 (b);
 +
@@ -553,6 +556,31 @@ index 88c9251c18..9d36de66f9 100644
 +   Deferring via dispatch_async lets the current method return first,
 +   freeing the main queue for VoiceOver's dispatch_sync calls.  */
 +
++/* Return true if FACE (a symbol or list of symbols) looks like a
++   "selected item" face.  Substring match is intentionally broad ---
++   it catches vertico-current, icomplete-selected-match,
++   ivy-current-match, company-tooltip-selection, and similar.
++   False positives are harmless: this runs only on overlay/child-frame
++   strings during completion, never in a hot redisplay path.  */
++static bool
++ns_ax_face_is_selected (Lisp_Object face)
++{
++  if (SYMBOLP (face) && !NILP (face))
++    {
++      const char *name = SSDATA (SYMBOL_NAME (face));
++      if (strstr (name, "current") || strstr (name, "selected")
++	  || strstr (name, "selection"))
++	return true;
++    }
++  if (CONSP (face))
++    {
++      for (Lisp_Object tail = face; CONSP (tail); tail = XCDR (tail))
++	if (ns_ax_face_is_selected (XCAR (tail)))
++	  return true;
++    }
++  return false;
++}
++
 +static inline void
 +ns_ax_post_notification (id element,
 +			  NSAccessibilityNotificationName name)
@@ -633,7 +661,7 @@ index 88c9251c18..9d36de66f9 100644
  /* ==========================================================================
  
      EmacsView implementation
-@@ -11657,6 +12084,24 @@ Convert an X font name (XLFD) to an NS font name.
+@@ -11657,6 +12112,24 @@ Convert an X font name (XLFD) to an NS font name.
    DEFSYM (Qns_drag_operation_generic, "ns-drag-operation-generic");
    DEFSYM (Qns_handle_drag_motion, "ns-handle-drag-motion");
  
@@ -658,7 +686,7 @@ index 88c9251c18..9d36de66f9 100644
    Fput (Qalt, Qmodifier_value, make_fixnum (alt_modifier));
    Fput (Qhyper, Qmodifier_value, make_fixnum (hyper_modifier));
    Fput (Qmeta, Qmodifier_value, make_fixnum (meta_modifier));
-@@ -11805,6 +12250,15 @@ Nil means use fullscreen the old (< 10.7) way.  The old way works better with
+@@ -11805,6 +12278,15 @@ Nil means use fullscreen the old (< 10.7) way.  The old way works better with
  This variable is ignored on Mac OS X < 10.7 and GNUstep.  */);
    ns_use_srgb_colorspace = YES;