GUI: wire real feature state and config

Replace the dummy preview controls with the actual settings:

- cards bind directly to the feature state and the existing option
  variables; Active/Bind now drive the same gates as the text menu;
- every feature persists active+bind, including movement, melee and spread;
- config path and build info are real; Reload config re-reads the INI;
- Reset defaults is two-click, restores feature settings/binds and keeps
  the GUI layout;
- window position, category and expanded cards persist under [gui] in the
  same config file; layout saves on drag/category/expand/close;
- mouse bind capture handles all five buttons and consumes the click so it
  cannot re-arm immediately;
- Active/Bind tooltips and full scancode names.

The old text tree stays on F1 for one verification pass.

1 files changed, 4 insertions, 4 deletions

diff --git a/docs/adr/0001-custom-isurface-gui.md b/docs/adr/0001-custom-isurface-gui.md
index 5525844..21fc7f6 100644
--- a/docs/adr/0001-custom-isurface-gui.md
+++ b/docs/adr/0001-custom-isurface-gui.md
@@ -53,7 +53,7 @@ path.
 - No new runtime dependency or GL context management.
 - The GUI remains inside the engine's VGUI paint path, so it inherits the
   existing font registration and in-game overlay behavior.
-- The old text menu is removed once the GUI reaches feature parity. During
-  development the GUI is built alongside the text menu; Insert toggles the
-  GUI and F1 keeps the old tree accessible. The replacement is complete only
-  when the old tree is deleted.
+- The GUI drives the real feature state/config. The old text menu is removed
+  after a verification pass; Insert toggles the GUI and F1 keeps the old tree
+  accessible until then. The replacement is complete when the old tree is
+  deleted.