opencode native 0.7.0

Added

• Zoom and pan in the image viewer: the wheel zooms where the pointer is, a drag or the arrows move the picture, + - 0 and
  buttons, a double click between fit and 100 %. From half of what fits up to 8 times its pixels. A click no longer closes it.
• Scroll bars hide unless the pointer is over what they scroll, or the keyboard just scrolled it (a setting, on by default).
• An older installed copy is offered an upgrade: Setup opens at the start of a newer copy, once per version.
• tools/screenshots.mjs regenerates every picture of the README and the site over the DevTools protocol, the mouse and the
  windows in front left alone; --linux takes the Linux one from a release's build in WSL (tools/wsl_client.sh).
  --size=<w>x<h> sets the window's size in pixels, --image=<file> opens the viewer on a file.

Changed

• gui_toolkit 0.59.0.

Fixed

• The join of the sidebar, its splitter and the bars: one carved line, from the title bar down through the status bar, no doubled borders or gaps.

Windows 10 and 11 (x64): one executable; run it, or install it for your user from its Setup (title bar menu > Setup...).
Linux (x64): the archive holds one program; run it, or ./opencode-native --install (an entry in the applications menu). Needs Vulkan, libxkbcommon, fontconfig, Wayland or X11.

It finds the opencode server of the computer by itself (another one: --url, or the status bar's server menu).