fix(ui): OP3 re-review residuals R1/R2/R3 (coordinator pass)

R1: the gate script no longer promises a timestamp prefix on the Magic
macro lines — acdream renders no chat timestamps yet (the Display
Timestamps consumer is OP4 scope; no chat-log file exists, TS-69). A
bare light-blue transcript line is the CORRECT gate outcome.

R2: IsGrounded yields null (silent) for a NULL controller in player
mode — the prior pattern returned false and fired the mid-air refusal
retail cannot produce in that state; comments now match the code.

R3: the dormant-ActivePageChanged pin now applies the real stimulus —
every authored tab button on a dormant host must carry NO click handler
(RetailTabBinding.SetClick never ran), which is AD-73's actual dormancy
mechanism; SwitchTo deliberately has no guard.

OP3 is CLOSED: dual APPROVE-WITH-FIXES -> fix round 386076af ->
re-review REOPEN(narrow) -> this pass. Connected gate now READY.

Full Release suite: 12,956 passed / 4 skipped / 0 failed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.App/Composition/InteractionRetainedUiComposition.cs

@@ -811,9 +811,15 @@ internal sealed class RetailInteractionRetainedUiCompositionFactory
                     // into "not grounded", which fired the mid-air message
                     // outside player mode — the opposite of retail and the
                     // opposite of what the old comment here claimed.
-                    IsGrounded: () => !d.PlayerMode.IsPlayerMode
-                        ? (bool?)null
-                        : d.PlayerController.Controller is { IsAirborne: false },
+                    // R2 (OP3 re-review, 2026-08-11): a NULL controller in
+                    // player mode must ALSO yield null (silent) — the prior
+                    // `is { IsAirborne: false }` pattern returned false for
+                    // null and fired the refusal retail cannot produce.
+                    IsGrounded: () =>
+                        d.PlayerMode.IsPlayerMode
+                        && d.PlayerController.Controller is { } liveController
+                            ? !liveController.IsAirborne
+                            : (bool?)null,
                     IsUseMouseTurningEnabled: () =>
                         CharacterOptionTable.TryGet(
                             CharacterOptionId.UseMouseTurning,