feat: version string formatting yy.mm.dd.hhmmss, app icon, and test fixes

stub/build.rs

@@ -9,15 +9,14 @@ fn main() {
         .unwrap_or_else(|| "unknown".to_string());
 
     let git_date = Command::new("git")
-        .args(["log", "-1", "--format=%cd", "--date=format:%Y.%m.%d"])
+        .args(["log", "-1", "--format=%cd", "--date=format:%y.%m.%d.%H%M%S"])
         .output()
         .ok()
         .and_then(|out| String::from_utf8(out.stdout).ok())
         .unwrap_or_else(|| "unknown".to_string());
 
     let version = format!(
-        "{} ({} {})",
-        env!("CARGO_PKG_VERSION"),
+        "{} ({})",
         git_date.trim(),
         git_hash.trim()
     );