feat: persist matchmaking recovery state

Game/scripts/matchmaking_state.gd

@@ -70,6 +70,7 @@ func apply_ticket_update(update: Dictionary) -> bool:
 		message = String(update["message"])
 	else:
 		message = ""
+	needs_resync = false
 	_emit_changed()
 	return true
 
@@ -106,6 +107,7 @@ func apply_proposal_update(update: Dictionary) -> bool:
 		return _request_resync(proposal_id)
 	proposal_revision = incoming_revision
 	proposal_state = incoming_proposal_state
+	needs_resync = false
 	if incoming_proposal_state == "OPEN" or incoming_proposal_state == "ACCEPTED":
 		message = ""
 	if update.has("expires_at_unix"):
@@ -143,6 +145,31 @@ func set_notice(notice: String) -> void:
 	_emit_changed()
 
 
+func restore_snapshot(saved: Dictionary) -> bool:
+	_reset()
+	if saved.is_empty():
+		return true
+	var saved_phase := String(saved.get("phase", IDLE))
+	var saved_ticket_id := String(saved.get("ticket_id", ""))
+	if saved_ticket_id.is_empty() or not _is_ticket_state(saved_phase):
+		return false
+	var saved_playlist := String(saved.get("playlist", ""))
+	if saved_playlist != "casual" and saved_playlist != "ranked":
+		return false
+	ticket_id = saved_ticket_id
+	playlist = saved_playlist
+	phase = saved_phase
+	revision = maxi(0, int(saved.get("revision", 0)))
+	expires_at_unix = maxi(0, int(saved.get("expires_at_unix", 0)))
+	proposal_id = String(saved.get("proposal_id", ""))
+	proposal_revision = maxi(0, int(saved.get("proposal_revision", 0)))
+	proposal_state = String(saved.get("proposal_state", ""))
+	message = "Recovering authoritative matchmaking state"
+	needs_resync = phase != CANCELLED and phase != EXPIRED and phase != FAILED
+	_emit_changed()
+	return true
+
+
 func can_cancel() -> bool:
 	return phase == QUEUED or phase == PROPOSED or phase == ALLOCATING