fix(header): bound tty color query wall-clock wait

Author: Han5991

crates/vite_shared/src/header.rs

@@ -253,6 +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)]
@@ -294,6 +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},