merge the macOS app branch: the AppKit shell, pixel attachments, live theming, and mupdf -Djpx

Three commits off 38e9919 (macos-app@upstream) merged into main's ghostty bump.
No textual conflicts, and two things the merge needed:

- nested.zig asked libc for fstatat. Darwin has it; on linux std.c declares it
  `void` (glibc hides it behind a versioned symbol std cannot name), so the tty
  build stopped at 'type void not a function'. statNoFollow keeps fstatat on
  darwin and asks statx on linux for the same three fields, which is what this
  file did before the branch generalized it to both platforms.

- .DS_Store rode along with a797a1a. Deleted, and .gitignore now says so.

linux: snap 86/86, unit-test, image-harness and mupdf-check green. nested.zig
also type-checks for aarch64-macos.

1 files changed, 6 insertions, 0 deletions

diff --git a/docs/config.md b/docs/config.md
index cba7e5fc..7b35586c 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -8,6 +8,12 @@ Native pardes builds read a per-user `pardes` file before the first frame:
 - Windows: `%LOCALAPPDATA%\pardes`, with `%USERPROFILE%\AppData\Local\pardes`
   as the fallback.
 
+`Config` (`SPC f c`, or the word executed anywhere) prints the resolved path
+into a `+Config` output pane, so the machine answers this rather than the list
+above. The path is printed whether or not a file is there — that is the case
+you ask in — and the row is ordinary text, so a right click on it opens the
+file.
+
 The browser build has no local user-config path and does not load this file.
 
 The format is one existing builtin command per line, using the same spelling