Implement nested question remediation and review content

scripts/autoload/block_session_service.gd

@@ -8,6 +8,7 @@ var current_index := 0
 var mode := "Tutor"
 var system_name := "All Systems"
 var seconds_remaining := 0.0
+var session_initial_seconds := 0.0
 var block_started := false
 var session_kind := "block"
 var core_question_pool: Array = []
@@ -39,6 +40,7 @@ func start_block(selected_system: String, block_size: int, selected_mode: String
 	answers.resize(active_questions.size())
 	current_index = 0
 	seconds_remaining = float(active_questions.size() * 90)
+	session_initial_seconds = seconds_remaining
 	block_started = true
 	session_changed.emit()
 
@@ -52,6 +54,7 @@ func start_core_run() -> bool:
 	core_question_pool.clear()
 	current_index = -1
 	seconds_remaining = 0.0
+	session_initial_seconds = core_current_target_seconds
 	block_started = true
 	core_answer_count = 0
 	core_score = 0
@@ -82,6 +85,7 @@ func start_simulation_block(questions: Array, block_index: int, total_blocks: in
 	simulation_total_blocks = total_blocks
 	simulation_deadline_unix = deadline_unix
 	seconds_remaining = maxf(0.0, deadline_unix - Time.get_unix_time_from_system())
+	session_initial_seconds = maxf(seconds_remaining, float(active_questions.size() * 90))
 	block_started = true
 	current_question_started_at = Time.get_ticks_msec() / 1000.0
 	session_changed.emit()
@@ -335,6 +339,14 @@ func get_core_timer_ratio() -> float:
 	return clamp(ratio, 0.0, 1.0)
 
 
+func get_session_timer_ratio() -> float:
+	if session_kind == "core":
+		return get_core_timer_ratio()
+	if session_initial_seconds <= 0.0:
+		return 1.0
+	return clamp(seconds_remaining / session_initial_seconds, 0.0, 1.0)
+
+
 func pause_current_question_timer() -> void:
 	if session_kind == "core" and current_question_pause_started_at <= 0.0:
 		current_question_pause_started_at = Time.get_ticks_msec() / 1000.0