fix(installer): enable ANSI color support on Windows, disable if unsupported

Older Windows consoles (cmd.exe) don't process ANSI escape codes by
default, showing raw escape sequences like ←[36m instead of colors.
Try to enable virtual terminal processing on both stdout and stderr
via SetConsoleMode. If that fails (legacy console, redirected output),
disable owo_colors globally so output is plain text.

Author: fengmk2

crates/vite_installer/src/main.rs

@@ -38,8 +38,52 @@ fn init_dll_security() {
 #[cfg(not(windows))]
 fn init_dll_security() {}
 
+/// Enable ANSI color support on Windows.
+///
+/// Older Windows consoles (cmd.exe) don't process ANSI escape codes by default.
+/// We try to enable virtual terminal processing; if that fails (e.g. redirected
+/// output, legacy console), we disable colors globally via owo_colors.
+#[cfg(windows)]
+fn init_colors() {
+    unsafe extern "system" {
+        fn GetStdHandle(nStdHandle: u32) -> isize;
+        fn GetConsoleMode(hConsoleHandle: isize, lpMode: *mut u32) -> i32;
+        fn SetConsoleMode(hConsoleHandle: isize, dwMode: u32) -> i32;
+    }
+    const STD_OUTPUT_HANDLE: u32 = 0xFFFF_FFF5; // -11i32 as u32
+    const STD_ERROR_HANDLE: u32 = 0xFFFF_FFF4; // -12i32 as u32
+    const ENABLE_VIRTUAL_TERMINAL_PROCESSING: u32 = 0x0004;
+
+    let enable_vt = |std_handle: u32| -> bool {
+        unsafe {
+            let handle = GetStdHandle(std_handle);
+            if handle == -1_isize {
+                return false;
+            }
+            let mut mode: u32 = 0;
+            if GetConsoleMode(handle, &mut mode) != 0 {
+                SetConsoleMode(handle, mode | ENABLE_VIRTUAL_TERMINAL_PROCESSING) != 0
+            } else {
+                false
+            }
+        }
+    };
+
+    // Enable on both stdout (interactive menu) and stderr (info/warn/error)
+    let stdout_ok = enable_vt(STD_OUTPUT_HANDLE);
+    let stderr_ok = enable_vt(STD_ERROR_HANDLE);
+
+    if !stdout_ok && !stderr_ok {
+        owo_colors::set_override(false);
+    }
+}
+
+#[cfg(not(windows))]
+fn init_colors() {}
+
 fn main() {
     init_dll_security();
+    init_colors();
 
     let opts = cli::parse();