GUI: allow movement while open; freeze look and block bind capture

Feedback pass on the preview shell:

- Freeze the rendered view explicitly in CreateMove and again at
  FRAME_RENDER_START; CInput was still letting mouse look move the camera.
- Allow normal WASD/jump/duck movement while the GUI is open; strip
  attack/use/impulse/weapon selection so GUI clicks do not fire.
- While bind capture is active, block all game input.
- Esc no longer closes the GUI; it only cancels bind capture. F2 or the
  title-bar X close the preview.
- Interpose SDL_ShowCursor / SDL_SetRelativeMouseMode / warp / window grab so
  the game cannot re-capture or hide the native cursor while the GUI is open.

1 files changed, 10 insertions, 6 deletions

diff --git a/CONTEXT.md b/CONTEXT.md
index 1c43b1f..53c662e 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -148,20 +148,24 @@ Binds use SDL scancodes; mouse buttons are pseudo-scancodes 600..604.
 - **Category**: sidebar group. Movement, Combat, Visuals, Weapons, System.
 - **Card**: per-feature panel. Header always shows Active + Bind; body is a
   collapsible set of settings.
-- **Freeze**: while the GUI is open, the usercmd movement/buttons/impulses/view
-  are held and combat features are skipped; the game keeps simulating and
-  ESP/FOV circle/speed graph keep drawing. No invulnerability.
+- **Freeze**: while the GUI is open, look/attack/use/impulse/weapon selection
+  are blocked and combat features are skipped, but normal WASD/jump/duck
+  movement is allowed. Bind capture blocks all game input until it ends. The
+  game keeps simulating and ESP/FOV circle/speed graph keep drawing. No
+  invulnerability.
 - **Native cursor**: on open, leave SDL relative-mouse mode and show the OS
   cursor; restore on close. Absolute mouse coordinates are used.
-- **Bind capture**: click Bind, press a key/button; Esc or clicking elsewhere
-  cancels; Clear sets None; Insert is reserved for the GUI.
+- **Bind capture**: click Bind, press a key/button; Esc cancels capture but
+  does not close the GUI; clicking elsewhere cancels; Clear sets None; Insert
+  is reserved for the GUI.
 - **UI scale**: `clamp(min(screen_w/1920, screen_h/1080), 0.75, 1.5)`; base
   window 960x620, body/title fonts 15/20 px at scale 1.
 - Every feature gets Active + Bind; bind None means always-on.
 - System page: config path/build info, Reload config, and a two-click Reset
   that restores feature settings/binds but keeps GUI layout.
 - Window: fixed-size, draggable by title bar, clamped to screen, position,
-  category and expanded cards persisted under `[gui]`.
+  category and expanded cards persisted under `[gui]`. Esc does not close the
+  GUI; the toggle key or title-bar X does.
 
 
 ## Bones / ESP