Fix for + tile crashing in Tab Overview

[nmggithub]

I have this branch up to fix #10252. It was written with AI, but only after I made sure I thoroughly understood what was happening (almost to an excessive extent). My sole commit: nmggithub@dd4e36f

TL;DR: deep within AppKit, there is an Objective-C exception that is always thrown when opening a new tab from the visual tab picker ("tab overview"). Objective-C exceptions cannot be safely recovered from in Swift. As Ghostty is primarily Swift, we must introduce some Objective-C wrapper around tab creation to safely swallow this exception.

There is a lot more I know about this than the above, and can discuss it at length if desired. Interestingly, it seems debug builds of Ghostty (zig build run) do gracefully recover and don't crash. Release builds (zig build run -Doptimize=ReleaseFast), however, do crash. The crashing seems to be expected behavior and I don't think there's any feasible way to get release builds to recover as debug builds do. The debug builds do, arguably, have better animation behavior. Not sure how I can approach that part.

Release build off of my commit:

Screen.Recording.2026-02-24.at.20.56.35.mov

Debug build off db1e31c7a69924913e8faafcedb290de3cb4a8b6 (current main, as of writing):

Screen.Recording.2026-02-24.at.20.58.04.mov

[jcollie]

Once you're vouched, go ahead and open a PR. No need for further discussion.

[nmggithub]

Thanks! I wasn't sure if this line in the CONTRIBUTING.md applied:

ghostty/CONTRIBUTING.md

Lines 189 to 193 in d1a32d3

	> [!NOTE]
	>
	> **Pull requests are NOT a place to discuss feature design.** Please do
	> not open a WIP pull request to discuss a feature. Instead, use a discussion
	> and link to your branch.

[jcollie]

Bug fixes aren't feature design discussions, where there are a lot of subjective decisions to be made. We'll know pretty easily if your bug fix works and be able to judge the quality of the code.