make cargo balance ui updating its own component (#28295)

* add BankClientComponent and event

* query BankClient instead of hardcoded CargoOrderConsole for updating

* add BankClient to all ordering consoles

* :trollface:

* add Balance field to BankClient

* forgor

Co-authored-by: ShadowCommander <10494922+ShadowCommander@users.noreply.github.com>

* m

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>
Co-authored-by: ShadowCommander <10494922+ShadowCommander@users.noreply.github.com>

Content.Shared/Cargo/Components/BankClientComponent.cs

@@ -0,0 +1,26 @@
+using Content.Shared.Cargo;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Cargo.Components;
+
+/// <summary>
+/// Makes an entity a client of the station's bank account.
+/// When its balance changes it will have <see cref="BankBalanceUpdatedEvent"/> raised on it.
+/// Other systems can then use this for logic or to update ui states.
+/// </summary>
+[RegisterComponent, NetworkedComponent, Access(typeof(SharedCargoSystem))]
+[AutoGenerateComponentState]
+public sealed partial class BankClientComponent : Component
+{
+    /// <summary>
+    /// The balance updated for the last station this entity was a part of.
+    /// </summary>
+    [DataField, AutoNetworkedField]
+    public int Balance;
+}
+
+/// <summary>
+/// Raised on an entity with <see cref="BankClientComponent"/> when the bank's balance is updated.
+/// </summary>
+[ByRefEvent]
+public record struct BankBalanceUpdatedEvent(EntityUid Station, int Balance);