Block aiming down sights during weapon reloads

The shared ADS permission check excluded weapon switches, melee and offhand
states but omitted the reload family. Holding or requesting ADS during a
reload could therefore keep raising the weapon and zooming the view.

Reject ADS throughout Reloading, ReloadingInterrupt, ReloadStart,
ReloadStartInterrupt and ReloadEnd using the existing weapon-state helper.
The normal ADS intent/fraction update then lowers the weapon at its ADS-out
rate and prevents re-entry until the reload ends. The same permission check
runs in authoritative simulation and client prediction, covering keyboard
reload and controller use/reload without changing their bindings.

Validation: play build, targeted rustfmt and diff checks passed. A temporary
probe reproduced the permissive behavior with the previous implementation,
then verified ADS exit and blocked entry for all five reload states with
RELOAD and USE_RELOAD inputs. It also checked ADS recovery when ready and
preserved firing/rechamber permissions. No in-game visual retest was run.

crates/weapon_iw4/src/ads_allow.rs

@@ -38,6 +38,11 @@ pub fn is_ads_allowed(
 
     let ws = ps.weaponstate_primary;
 
+    // Reload start, magazine/shell insertion, interruption and end all leave ADS.
+    if crate::WeaponState::from_i32(ws).is_ok_and(crate::WeaponState::is_reload_family) {
+        return false;
+    }
+
     if (0x10..=0x15).contains(&ws) {
         return false;
     }