Add setting for removing window decoration on macos

[SATBH]

I would like for there to be an option for removing window decorations like kitty or ghostty have for macos. I kind of hate the vertical space lost on these type of things. If possible I wouldn't mind adding this feature myself.

[SATBH]

here is an screenshot of how i have it set up right now. It's not pr ready or anything since i just changed things directly on a local build of the app. I could probably draft a proper PR over the weekend

[adibhanna]

shipped it!

[adibhanna]

Implemented for 2.50.3 in 330c5778.

Under Settings → Appearance → Chrome, turn off Window title bar to remove the main window's title row and window controls. The sidebar, tabs, and editor stay available, reclaiming 44 pixels of vertical space. The setting is on by default.

• The preference is saved as [appearance].show_window_title_bar in config.toml and applies live across open vault windows.
• Press Cmd/Ctrl+, to reopen Settings and restore it.
• On macOS, native window buttons follow the setting, including after fullscreen transitions.
• The setting also removes the app's title row on Linux and Windows, for setups such as Hyprland. Compositor-managed borders and shadows remain under the window manager's control.

Verified in the built macOS app: toggling, keyboard recovery, two vault windows, persistence after restart, and native fullscreen. Regression tests cover macOS/Linux/Windows rendering, settings search, and persistence. Native Hyprland/Linux and Windows validation remains outstanding.

Matching help documentation is in website commit efb446e. Closing as completed for 2.50.3.