[Warp] Automatically expand and contract Warp window from a base size when viewing file tree or file

### Pre-submit Checks - [x] I have [searched Warp feature requests](https://github.com/warpdotdev/warp/issues?q=is%3Aissue+label%3AFEATURE) and there are no duplicates - [x] I have [searched Warp docs](https://docs.warp.dev) and my feature is not there ### Describe the solution you'd like? When Warp is just a terminal (meaning, currently viewing ONLY the terminal and not the file tree to the left or any individual file's content to the right), I would set this as a "base size" for the window (a base narrow width since all I am looking at is the terminal). But when I click to add the file tree view pane on the left or viewing individual files on the right, the window expands outward to meet those extra space requirements - but I have to resize them every time. I would like to set pre-set sizes for when these panes are used so that everything expands and collapses back to the same set of sizes instead of having to manually click and drag to change the window width every time to accomo