fix(startup): recover from race condition that causes Zellij to start in the wrong size #3218
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This fixes several issues in which Zellij starts up without filling up the whole terminal window.
While the race condition is arguably the responsibility of the terminal emulator (starting the program on the secondary side of the PTY without first setting the size of the STDOUT fd - essentially passing it to termios if in the context of *nix systems), we should definitely be able to recover from this - which is what this PR does.