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, 2 insertions, 1 deletions

diff --git a/src/hl2h.h b/src/hl2h.h
index 8a81439..d5a9dc3 100644
--- a/src/hl2h.h
+++ b/src/hl2h.h
@@ -129,7 +129,7 @@ struct CUserCmd {
 // engine constants
 // ---------------------------------------------------------------------------
 
-enum { IN_ATTACK = 1 << 0, IN_JUMP = 1 << 1, IN_DUCK = 1 << 2, IN_USE = 1 << 5, IN_ATTACK2 = 1 << 11 };
+enum { IN_ATTACK = 1 << 0, IN_JUMP = 1 << 1, IN_DUCK = 1 << 2, IN_USE = 1 << 5, IN_ATTACK2 = 1 << 11, IN_SPEED = 1 << 17 };
 enum { FL_ONGROUND = 1 << 0, FL_DUCKING = 1 << 1, FL_INWATER = 1 << 9 };
 enum { MOVETYPE_WALK = 2, MOVETYPE_NOCLIP = 8, MOVETYPE_LADDER = 9 };
 
@@ -180,6 +180,7 @@ enum EspOption {
 // ---------------------------------------------------------------------------
 void note_modified(const CUserCmd *cmd, int flags, const float *vel);
 CUserCmd *get_usercmd(int seq);
+void input_clear_mouse_states();
 void fix_verified_crc(int seq, uint32_t crc);
 uint32_t usercmd_checksum(const CUserCmd *c);
 bool find_input_global();