fix(cli): prevent TTY hang during command delegation (#1396)

crates/vite_shared/src/header.rs

@@ -240,7 +240,6 @@ fn is_osc_query_unsupported() -> bool {
         if std::env::var_os("TMUX").is_some() || std::env::var_os("STY").is_some() {
             return true;
         }
-
         false
     })
 }
@@ -254,6 +253,9 @@ fn is_osc_query_unsupported() -> bool {
 #[cfg(unix)]
 const DA1: &str = "\x1b[c";
 
+#[cfg(unix)]
+const QUERY_TERMINAL_COLORS_WALL_CLOCK_TIMEOUT_MS: u64 = 250;
+
 /// Reads from a `BufRead` until one of two delimiter bytes is found.
 /// Modelled after `terminal-colorsaurus`'s `read_until2`.
 #[cfg(unix)]
@@ -295,6 +297,29 @@ fn read_until_either(
 /// ordering/completeness ambiguities of flat-buffer pattern matching.
 #[cfg(unix)]
 fn query_terminal_colors(palette_indices: &[u8]) -> (Option<Rgb>, Vec<(u8, Rgb)>) {
+    let indices = palette_indices.to_vec();
+    let (tx, rx) = std::sync::mpsc::channel();
+
+    let Ok(_handle) =
+        std::thread::Builder::new().name("vp-tty-color-query".into()).spawn(move || {
+            let _ = tx.send(query_terminal_colors_inner(&indices));
+        })
+    else {
+        return (None, vec![]);
+    };
+
+    rx.recv_timeout(Duration::from_millis(QUERY_TERMINAL_COLORS_WALL_CLOCK_TIMEOUT_MS))
+        .unwrap_or((None, vec![]))
+}
+
+/// Queries terminal colors using the DA1 sandwich technique with
+/// stream-based response parsing (modelled after `terminal-colorsaurus`).
+///
+/// Responses are read sequentially using `BufReader` + `read_until`,
+/// which provides exact response boundaries and eliminates the
+/// ordering/completeness ambiguities of flat-buffer pattern matching.
+#[cfg(unix)]
+fn query_terminal_colors_inner(palette_indices: &[u8]) -> (Option<Rgb>, Vec<(u8, Rgb)>) {
     use std::{
         fs::OpenOptions,
         io::{self, BufRead, BufReader},
@@ -536,6 +561,21 @@ pub fn vite_plus_header() -> String {
     render_header_variant(header_colors.blue, &header_colors.suffix_gradient, true, true)
 }
 
+#[must_use]
+pub fn vite_plus_header_static() -> String {
+    if !should_colorize() || !supports_true_color() {
+        return format!("VITE+{HEADER_SUFFIX}");
+    }
+
+    let suffix_gradient = gradient_eased(
+        HEADER_SUFFIX.chars().count(),
+        DEFAULT_BLUE,
+        DEFAULT_MAGENTA,
+        HEADER_SUFFIX_FADE_GAMMA,
+    );
+    render_header_variant(DEFAULT_BLUE, &suffix_gradient, true, true)
+}
+
 #[cfg(all(test, unix))]
 mod tests {
     use std::io::{BufReader, Cursor};