patches: squash perf fixes into respective patches, clean 9-patch series

Performance fixes folded back:
- BUF_CHARS_MODIFF → patch 0002 (implement buffer accessibility element)
- UAZoomEnabled cache + rate-limit → patch 0000 (Zoom integration)

Also in patch 0000: ns_zoom_face_is_selected (standalone compilation).
Also in patch 0001: ns_accessibility_enabled defaults to nil.

patches/0005-ns-integrate-accessibility-with-EmacsView-and-redisp.patch

@@ -1,8 +1,7 @@
-From 0f7896d526a9ad17fa34c75dd7eaf15f59e070cd Mon Sep 17 00:00:00 2001
+From 495554a23725688fb7030e6837efff5341e8e9a2 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
-Subject: [PATCH 06/11] ns: integrate accessibility with EmacsView and
- redisplay
+Subject: [PATCH 6/9] ns: integrate accessibility with EmacsView and redisplay
 
 Wire the accessibility infrastructure into EmacsView and the
 
@@ -52,10 +51,10 @@ index 80661a9..2b1f9e6 100644
  ** Re-introduced dictation, lost in Emacs v30 (macOS).
  We lost macOS dictation in v30 when migrating to NSTextInputClient.
 diff --git a/src/nsterm.m b/src/nsterm.m
-index a056c1b..92a0dde 100644
+index 01751ce..f7da553 100644
 --- a/src/nsterm.m
 +++ b/src/nsterm.m
-@@ -1370,6 +1370,9 @@ so the visual offset is (ov_line + 1) * line_h from
+@@ -1404,6 +1404,9 @@ so the visual offset is (ov_line + 1) * line_h from
    if (view)
      ns_zoom_track_completion (f, view);
  #endif /* NS_IMPL_COCOA */
@@ -65,7 +64,7 @@ index a056c1b..92a0dde 100644
  }
  
  static void
-@@ -7585,7 +7588,6 @@ - (id)accessibilityTopLevelUIElement
+@@ -7619,7 +7622,6 @@ - (id)accessibilityTopLevelUIElement
  
  
  
@@ -73,7 +72,7 @@ index a056c1b..92a0dde 100644
  static BOOL
  ns_ax_find_completion_overlay_range (struct buffer *b, ptrdiff_t point,
  				     ptrdiff_t *out_start,
-@@ -8680,7 +8682,6 @@ - (NSRect)accessibilityFrame
+@@ -8721,7 +8723,6 @@ - (NSRect)accessibilityFrame
  @end
  
  
@@ -81,7 +80,7 @@ index a056c1b..92a0dde 100644
  /* ===================================================================
     EmacsAccessibilityBuffer (Notifications) — AX event dispatch
  
-@@ -9225,7 +9226,6 @@ - (NSRect)accessibilityFrame
+@@ -9266,7 +9267,6 @@ - (NSRect)accessibilityFrame
  @end
  
  
@@ -89,7 +88,7 @@ index a056c1b..92a0dde 100644
  /* ===================================================================
     EmacsAccessibilityInteractiveSpan — helpers and implementation
     =================================================================== */
-@@ -9555,6 +9555,7 @@ - (void)dealloc
+@@ -9596,6 +9596,7 @@ - (void)dealloc
    [layer release];
  #endif
  
@@ -97,7 +96,7 @@ index a056c1b..92a0dde 100644
    [[self menu] release];
    [super dealloc];
  }
-@@ -10903,6 +10904,32 @@ - (void)windowDidBecomeKey      /* for direct calls */
+@@ -10944,6 +10945,32 @@ - (void)windowDidBecomeKey      /* for direct calls */
    XSETFRAME (event.frame_or_window, emacsframe);
    kbd_buffer_store_event (&event);
    ns_send_appdefined (-1);  // Kick main loop
@@ -130,7 +129,7 @@ index a056c1b..92a0dde 100644
  }
  
  
-@@ -12143,6 +12170,332 @@ - (int) fullscreenState
+@@ -12184,6 +12211,332 @@ - (int) fullscreenState
    return fs_state;
  }