patches: fix 3 blockers — duplicate functions, idx typo, doc cap

BLOCKER fixes:
1. Remove duplicate ns_ax_face_is_selected, ns_ax_selected_overlay_text,
   ns_ax_selected_child_frame_text definitions from patch 0002
   (now defined only in 0007/0008 where they belong)
2. Fix idx → point_idx in accessibilityInsertionPointLineNumber (0002)
3. Remove stale 100K cap reference from documentation (0006)

Architecture fix:
- ns_ax_selected_child_frame_text moved from 0007 to 0008
  (where it logically belongs)

Verified: all 8 patches apply cleanly on fresh emacs HEAD.

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

@@ -1,4 +1,4 @@
-From 1bd12dd5d464d0c3f9774630014e434b8fb0e19e Mon Sep 17 00:00:00 2001
+From 4ddd874dcf700fc830796ce16d949ba7d2fa4d78 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
@@ -17,10 +17,10 @@ Tested on macOS 14.  Verified: Tab-cycling through org-mode links,
  1 file changed, 286 insertions(+)
 
 diff --git a/src/nsterm.m b/src/nsterm.m
-index f1a1b42..91d0241 100644
+index dfb84ca..c852929 100644
 --- a/src/nsterm.m
 +++ b/src/nsterm.m
-@@ -9169,6 +9169,292 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
+@@ -8919,6 +8919,292 @@ - (NSRect)accessibilityFrame
  
  @end