fix(B.6+B.7): shrink arrival safety margin; file #66 rotation, #67 door

Margin trim:
  Previous: min(0.5, threshold * 0.4) — for 3 m NPC arrived at 2.5 m
  New:      min(0.2, threshold * 0.2) — for 3 m NPC arrives at 2.8 m
  User feedback: 'compared to retail, it fires too close. In retail
  it fires from a longer range.' Smaller margin matches that — still
  safely inside ACE's strict WithinUseRadius but closer to the boundary.
  Tight pickup radii (0.6 m item) now arrive at 0.48 m (was 0.36 m).

Filed issues:
  #67  Door Use action doesn't complete after auto-walk arrival.
       NPC dialogue fires correctly post-flush-AP+re-send, but
       doors still go silent — need to investigate door-specific
       state requirements in ACE's Door.ActOnUse or our wire
       payload differences.
  #66  Rotation: local player flips back after auto-walk arrival
       (observed from retail observer); NPCs don't turn to face
       the player when used. Both rooted in missing MovementType=8
       TurnToObject handling. Supersedes #65 (which was local-only)
       with a unified rotation-handling phase scope.

src/AcDream.App/Input/PlayerMovementController.cs

@@ -448,15 +448,18 @@ public sealed class PlayerMovementController
         // Arrival predicate. CRITICAL: ACE's server-side WithinUseRadius
         // is strict (dist <= radius), so arriving exactly at the radius
         // boundary fails — ACE rejects the action and replies with
-        // another MoveToObject. To ensure the re-sent action lands
-        // INSIDE ACE's radius, we apply a safety margin that walks
-        // 0.3–0.5 m past the boundary (capped to 40 % of the threshold
-        // so tight pickup radii like 0.6 m stay reachable without
-        // collapsing to zero).
+        // another MoveToObject. We walk slightly INSIDE the boundary so
+        // the re-sent action lands safely in-range.
+        //
+        // The margin is small — user feedback says retail fires Use
+        // from longer range, so we minimise the over-walk: 0.2 m at
+        // typical NPC radii (3 m → arrive at 2.8 m), tapered for tight
+        // pickup radii (0.6 m → arrive at 0.48 m) so the body stays
+        // reachable but always inside ACE's strict check.
         float arrivalThreshold = _autoWalkMoveTowards
             ? _autoWalkDistanceToObject
             : _autoWalkMinDistance;
-        float safetyMargin    = MathF.Min(0.5f, arrivalThreshold * 0.4f);
+        float safetyMargin     = MathF.Min(0.2f, arrivalThreshold * 0.2f);
         float effectiveArrival = MathF.Max(arrivalThreshold - safetyMargin, 0.1f);
         bool arrived =
             (_autoWalkMoveTowards