gui_toolkit 0.51.0

Added

• A site on GitHub Pages (sachahjkl.github.io/gui_toolkit): site/, published by
  .github/workflows/pages.yml; the README tells about Linux.
• A Linux job in the CI (tools/linux_ci.sh, also for a local check in WSL): odin check -vet of every package for
  Linux, the examples built with the native text backend and Vulkan, the tests that need no window. examples/smoke
  printed the window's HWND, a field Windows only has.
• tools/fetch_wgpu.sh: wgpu-native's Linux static library, pinned by SHA-256, into Odin's vendor/wgpu/lib (Odin's
  Linux release does not ship it).
• ui.fuzzy_score: subsequence matching for pickers and palettes ("cs5" finds "claude-sonnet-5"), the tightest window,
  a score that ranks runs and word starts first, and the matched runs to highlight. ui.mouse_pressed: whether a
  press happened in this frame, wherever it landed (a popover closed by a press outside it).
• ui.line_edit(..., secret = true): a password field. Bullets are shown in place of the characters (the caret, the
  selection and the clicks follow them character by character), a double click selects all of it, Ctrl+C / Ctrl+X do
  nothing, and screen readers are told it is a password.

Changed

• Middle-click autoscroll (ui.autoscroll_axis_speed): the speed grows geometrically with the distance from the anchor, V * (2^(x/D) - 1) / (2^(F/D) - 1) (x past the dead zone, D = the new Autoscroll_Settings.doubling, F = full_dist, V = max_speed): it doubles every D px and reaches max_speed at full_dist. exponent (a power curve) is gone.

Fixed

• -vet failed on the Linux code: dbus casts, unused loop variables in the X11 backend, imports used on Windows only.
• -define:FONT_NATIVE_LINK=false linked kernel32.lib as its stand-in on every system: libc off Windows.
• Linux: the text renderer defaulted to the atlas, which nothing fills off Windows (no bitmap rasterizer): Slug there
  (FONT_TEXT_RENDERER).
• Linux: a translucent window asked for a half-float surface that Vulkan on X11 / Wayland does not offer (BGRA8 only):
  the surface's formats are checked, 8 bits a channel otherwise.
• Linux: the WebGPU backend defaulted to Direct3D 12 on every system: Vulkan off Windows (TOOLKIT_WGPU_BACKEND). Found
  by building opencode native for Linux, like the fixes below.
• ui.text_edit(wrap = true) could show a horizontal scrollbar: a wrapped text's width is the one of the last layout,
  and when the box became half a pixel narrower the bar appeared, though wrapped text never scrolls sideways.
• ui.row / ui.column keep a cross alignment given by next: next({cross = .Center}); if row() { ... } centred
  nothing, the scope's default (.Start) replaced it. An explicit cross argument other than .Start still wins.
• ui.checkbox, ui.radio, ui.toggle given no width are as wide as their mark (or switch) and their label: the row took
  the text size of its own text, which is empty, so the clickable part was a sliver at the left of the mark (a click on the
  label did nothing). A width given by next is kept, the label filling it as before.