Guard title truncation against narrow terminal widths

Prevent stack buffer underflow in InfoScreen_drawTitled() when the
terminal width is 2 columns or fewer, where COLS - 3 produces a
negative index into the title VLA.

Closes: GHSA-6f53-xw2h-ww59
Reported-by: Michał Majchrowicz (AFINE Team)
Reported-by: Marcin Wyczechowski (AFINE Team)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: natoscott

InfoScreen.c

@@ -55,7 +55,7 @@ void InfoScreen_drawTitled(InfoScreen* this, const char* fmt, ...) {
    int len = vsnprintf(title, sizeof(title), fmt, ap);
    va_end(ap);
 
-   if (len > COLS) {
+   if (len > COLS && COLS >= 3) {
       memset(&title[COLS - 3], '.', 3);
    }