fix: Windows core build, embedded init, byte-exact paths, version info

Closes the remaining core/lib/termio/GTK rows (final-Z2.md):
- ghostty-core compiles for Windows (Unix-only exec fields and file
  modes gated); checked with cargo check --target x86_64-pc-windows-gnu.
- Embedded init: ensure_locale, SIGPIPE ignored in ghostty_init for
  C/Swift hosts, Apple crash tags; the argv passed to ghostty_init feeds
  ghostty_config_load_cli_args; ghostty_config_load_file accepts
  non-UTF-8 paths.
- OSC 7 pwd, embedded surface cwd/command/env/initial input,
  ghostty_surface_text and GTK file drops keep raw bytes.
- XTVERSION, TERM_PROGRAM_VERSION, the About dialog and crash metadata
  use ghostty_build_info instead of hardcoded versions.

Test Plan:
- cargo test --workspace (3327 passed)
- cargo clippy --workspace --all-targets -- -D warnings

crates/ghostty-apprt-gtk/build.rs

@@ -69,6 +69,17 @@ fn main() {
     println!("cargo:rerun-if-changed=resources");
     println!("cargo:rerun-if-changed=build.rs");
 
+    // Source tarballs ship the prebuilt GResource bundle so packagers need
+    // neither blueprint-compiler nor glib-compile-resources (Zig:
+    // `GhosttyDist.Resource` for `ghostty_resources.{c,h}`). As in Zig, it is
+    // never used in a git checkout.
+    println!("cargo:rerun-if-changed=dist/ghostty.gresource");
+    let prebuilt = manifest.join("dist/ghostty.gresource");
+    if prebuilt.is_file() && !manifest.join("../../.git").exists() {
+        std::fs::copy(&prebuilt, out.join("ghostty.gresource")).unwrap();
+        return;
+    }
+
     let mut xml = String::new();
     xml.push_str("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<gresources>\n");