Warp open source sparks community fixes

Hot take: this is the kind of open source thread that signals real health, not just PR volume. The fixes are small, but they target annoying edge cases that users actually feel.

• –The + menu ordering bug was a good catch: filesystem iteration is nondeterministic, so the alphabetical sort makes the UI stable and predictable.
• –The `warp://` tilde-expansion fix removes a sharp edge in a core navigation path and improves URL action behavior across the board.
• –Header syntax highlighting for additional C++ extensions is a narrow change with outsized developer-facing value.
• –Deleting an unnecessary placeholder file is trivial on its own, but it reflects active cleanup and repository hygiene.
• –The broader signal is that Warp’s open source release is already attracting contributors who are fixing correctness, UX, and polish issues quickly.