fix: force legacy sgr rendering for broadest compatiblity

This fixes rendering in Windows Terminal and possibly others.

Flow now works correctly in kitty, ghostty, iterm2, gnome-terminal, konsole,
xterm, rxvt, alacritty, wezterm, foot and windows terminal.

src/renderer/vaxis/renderer.zig

@@ -84,6 +84,8 @@ pub fn panic(msg: []const u8, error_return_trace: ?*std.builtin.StackTrace, ret_
 }
 
 pub fn run(self: *Self) !void {
+    self.vx.sgr = .legacy;
+
     if (self.vx.tty == null) {
         self.vx.tty = try vaxis.Tty.init();
         panic_cleanup_tty = &(self.vx.tty.?);