patches: fix Corfu Zoom tracking — replace rate-limit with parent-frame guard

Root cause: the 50ms rate limit broke child-frame (Corfu) tracking.
When the Corfu child frame redraws, its ns_update_end fires first and
resets the rate-limit timer.  When the parent frame's ns_update_end
fires immediately after, the timer has not expired, so
ns_zoom_track_completion returns early without scanning child frames.
Zoom focus stays on the first candidate.

Fix: remove the rate limit; add a FRAME_PARENT_FRAME(f) guard instead.
Child frames have no completion children to scan; their parent's
ns_update_end does the scan via FOR_EACH_FRAME.  Returning early on
child-frame calls avoids the redundant scan and leaves the timer
problem moot.  Overhead without the rate limit is ~40 Lisp evaluations
per redisplay (~5-20 µs), acceptable given ns_zoom_enabled_p() already
caches the UAZoomEnabled() IPC call.

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

@@ -1,4 +1,4 @@
-From 388628944f6ecc74806932e0ee2ad89c3df669ed Mon Sep 17 00:00:00 2001
+From 7303dd3913729a454b44fe71219acbd612d624b4 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
 Subject: [PATCH 5/9] 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 ecc8c54..5eaf480 100644
+index 7e3d57a..1a21f2e 100644
 --- a/src/nsterm.m
 +++ b/src/nsterm.m
-@@ -9266,6 +9266,292 @@ - (NSRect)accessibilityFrame
+@@ -9263,6 +9263,292 @@ - (NSRect)accessibilityFrame
  
  @end