Fix right-alignment by detecting terminal width from stderr/stdin

When Claude Code captures stdout, term.GetSize on stdout fails and
falls back to 80 columns. Now tries stderr and stdin first (which
remain connected to the TTY), then COLUMNS env var, then 80.

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"bufio"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -212,10 +213,23 @@ func getGitInfo(cwd string) string {
 }
 
 // termWidthFunc returns the terminal width.
+// Tries stderr and stdin as fallbacks since stdout is typically piped
+// when Claude Code captures the status line output.
 // Replaced in tests to avoid depending on a real TTY.
 var termWidthFunc = func() (int, error) {
-	width, _, err := term.GetSize(int(os.Stdout.Fd()))
+	for _, fd := range []uintptr{os.Stderr.Fd(), os.Stdin.Fd(), os.Stdout.Fd()} {
-	return width, err
+		if width, _, err := term.GetSize(int(fd)); err == nil {
+			return width, nil
+		}
+	}
+	// Fall back to COLUMNS env var
+	if cols := os.Getenv("COLUMNS"); cols != "" {
+		var w int
+		if _, err := fmt.Sscanf(cols, "%d", &w); err == nil && w > 0 {
+			return w, nil
+		}
+	}
+	return 0, errors.New("no terminal detected")
 }
 
 func getTerminalWidth() int {