GUI: Insert-only close, freeze mouse look at the source

Feedback pass:

- Insert now toggles the GUI; the old text tree moved to F1.
- Remove the title-bar X. Insert is the only close path; Esc only cancels
  bind capture.
- Discard accumulated mouse deltas in CInput::CreateMove before the game can
  apply them (CInput::ClearStates), so the camera no longer moves for a frame
  and snaps back. Also skip ExtraMouseSample and zero relative mouse state
  while the GUI is open.
- Strip attack/use/impulse/weapon selection from the command while open;
  keep jump, duck and walk. Skip combat command edits (spread seed) too.
- Widen System page buttons so "Reload config" and "Reset defaults" fit.
- Update CONTEXT/ADR for the Insert-only close behavior.

1 files changed, 9 insertions, 8 deletions

diff --git a/CONTEXT.md b/CONTEXT.md
index 53c662e..6f6e59e 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -94,14 +94,14 @@ Relevant vtable slots (this build):
 
 ## Menu
 
-Starts fully collapsed on first open. `Insert` toggles; `Up`/`Down` navigate;
+Preview key: `F1` (the final GUI will replace this tree). Starts fully collapsed on first open. `F1` toggles; `Up`/`Down` navigate;
 `Enter` expands/toggles; `Left`/`Right` edit values; `Escape` closes.
 Bind rows enter bind-select mode: press a key/button to assign, `Escape` sets
 None (always-on), `Enter` cancels.
 
 > The text menu below is being replaced by the GUI described in the next
-> section. The old tree is kept only until the GUI reaches parity. The current
-> preview shell opens with F2; Insert still opens the text tree.
+> section. The old tree is kept only until the GUI reaches parity. During the
+> preview, **Insert** toggles the GUI and the old text tree is on **F1**.
 
 ```
 HL2hake
@@ -149,10 +149,11 @@ Binds use SDL scancodes; mouse buttons are pseudo-scancodes 600..604.
 - **Card**: per-feature panel. Header always shows Active + Bind; body is a
   collapsible set of settings.
 - **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.
+  are blocked and combat features are skipped, but normal WASD/jump/duck/walk
+  movement is allowed. Mouse deltas are discarded before `CInput::CreateMove`
+  can apply them (`CInput::ClearStates`), so the view cannot drift for a frame.
+  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 cancels capture but
@@ -165,7 +166,7 @@ Binds use SDL scancodes; mouse buttons are pseudo-scancodes 600..604.
   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]`. Esc does not close the
-  GUI; the toggle key or title-bar X does.
+  GUI; the toggle key (Insert) is the only close path. There is no title-bar X.
 
 
 ## Bones / ESP