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, 10 insertions, 1 deletions

diff --git a/tools/embed_zig_sources.zig b/tools/embed_zig_sources.zig
index 61427415..9934d09a 100644
--- a/tools/embed_zig_sources.zig
+++ b/tools/embed_zig_sources.zig
@@ -32,7 +32,16 @@ pub fn main(init: std.process.Init) !void {
     for (paths) |path| {
         const full_path = try std.Io.Dir.path.join(gpa, &.{ root, path });
         defer gpa.free(full_path);
-        const contents = try std.Io.Dir.cwd().readFileAlloc(io, full_path, gpa, .limited(64 * 1024 * 1024));
+        // `git ls-files` reports the INDEX, not the working tree, and the two
+        // disagree the moment a file is moved or deleted without staging it —
+        // an ordinary mid-edit state, and in a jj-colocated repo the normal one
+        // until the change is exported. A path that is no longer on disk is
+        // simply not a source to embed; failing the whole web build over it
+        // means an unrelated refactor breaks a shell it never touched.
+        const contents = std.Io.Dir.cwd().readFileAlloc(io, full_path, gpa, .limited(64 * 1024 * 1024)) catch |err| switch (err) {
+            error.FileNotFound => continue,
+            else => return err,
+        };
         defer gpa.free(contents);
         try generated.writer.print("    .{{ .path = \"{f}\", .contents = \"{f}\" }},\n", .{
             std.zig.fmtString(path),