opencode native 0.4.0

Added

• Linux (x64): the same program, built by build.sh (Vulkan through wgpu-native, the toolkit's native text backend
  in the Rust library, Lucide icons, fontconfig's fonts); Setup installs it in ~/.local/share with an applications menu
  entry and its icon; preferences in ~/.config/opencode-native. CI and releases build Windows and Linux.
• Several servers: the status bar's server is a menu (switch, add, edit, remove; a password field that shows bullets),
  saved in servers.txt; each connection has its own client and event stream, and switching drops what was read from the
  last one. Another computer's server is named in the title bar. --server=<name>.
• Pickers searched as one types for the agent and the model: subsequence matching ("cs5" finds Claude Sonnet 5, the
  provider counts too), the matched letters lit, the keyboard, the wheel (smooth), the current one checked.
• A timeline of tool calls: a carved rail through a run of calls, across the steps that go on from each other; a lamp
  only on the running call, a pip on the finished ones (red when it failed). Consecutive steps of the same agent and model
  share one header (a rail in the agent's colour). Work going on: a slot with a sweeping glint.
• --setup opens the Setup dialog at start; build.bat / build.sh take OUT=<file>.

Changed

• Fewer lamps and calmer glows: finished sub-agents and the connected state are pips; accent buttons glow only under the
  pointer; halos about half as strong.

Fixed

• Opening a session showed it at its top for a moment, then scrolled down: it lands at its bottom in the frame it arrives.
• Holding a splitter or a scrollbar on a high refresh rate screen was paced like a window at rest (the cadence's Drag
  state now: shown at once on a variable refresh screen).
• The composer showed a horizontal scrollbar (toolkit: a wrapped editor measured its width from the last layout).
• The carved line under the title bar was half covered by the sidebar, whose rounded corner also notched it: the lines
  between regions now have a box as thick as they are drawn (more than 2 px when the display is scaled), and the
  sidebar and the conversation have square corners.
• Dialogs hid the window behind them (an opaque backdrop): it shows through now, blurred and darkened.
• Setup: once installed, four buttons overflowed the dialog; what is left is Close and Open installed copy.

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).