Update ghostty to v1.3.0 (#1142)

* Update ghostty to v1.3.0

* Add bell handling and AppleScript support

* Add zsh shell integration handoff test

* Fix Ghostty zsh integration handoff in cmux

* Add terminal keypress notification dismissal test

* Dismiss terminal notifications on keypress

* Address PR review feedback

* Tighten notification dismissal regression test

* Pin GhosttyKit checksum for latest ghostty

ghostty.h

@@ -463,6 +463,12 @@ typedef struct {
 
 // Config types
 
+// config.Path
+typedef struct {
+  const char* path;
+  bool optional;
+} ghostty_config_path_s;
+
 // config.Color
 typedef struct {
   uint8_t r;