chore(global config): merged related consts

Merged `CONFY_APP_NAME` and `GLOBAL_CONFIG_BASE_NAME` into `APP_NAME`.
It is shorter and more meaningful.

src/main.rs

@@ -11,8 +11,8 @@ use typstfmt_lib::{format, Config};
 
 const VERSION: &str = env!("TYPSTFMT_VERSION");
 const CONFIG_FILE_NAME: &str = "typstfmt.toml";
-const CONFY_APP_NAME: &str = "typstfmt";
-const GLOBAL_CONFIG_BASE_NAME: &str = "typstfmt";
+/// Note: used in [`confy`](https://crates.io/crates/confy) functions.
+const APP_NAME: &str = "typstfmt";
 const HELP: &str = r#"Format Typst code
 
 usage: typstfmt [options] [file...]
@@ -157,7 +157,7 @@ fn main() -> Result<(), lexopt::Error> {
             }
             Long("get-global-config-path") => {
                 let config_path =
-                    confy::get_configuration_file_path(CONFY_APP_NAME, GLOBAL_CONFIG_BASE_NAME)
+                    confy::get_configuration_file_path(APP_NAME, APP_NAME)
                         .unwrap_or_else(|e| panic!("Error loading global configuration file: {e}"));
                 println!("{}", config_path.display());
                 return Ok(());
@@ -224,9 +224,9 @@ fn main() -> Result<(), lexopt::Error> {
             Config::from_toml(&buf).unwrap_or_else(|e| panic!("Config file invalid: {e}.\nYou'll maybe have to delete it and use -C to create a default config file."))
         } else {
             let config_path =
-                confy::get_configuration_file_path(CONFY_APP_NAME, GLOBAL_CONFIG_BASE_NAME)
+                confy::get_configuration_file_path(APP_NAME, APP_NAME)
                     .unwrap_or_else(|e| panic!("Error loading global configuration file: {e}"));
-            confy::load(CONFY_APP_NAME, GLOBAL_CONFIG_BASE_NAME).unwrap_or_else(|e| {
+            confy::load(APP_NAME, APP_NAME).unwrap_or_else(|e| {
                 panic!(
                     "Error loading global configuration file at {}: {e}",
                     config_path.display()