feat(progression): quêtes rotatives court-terme + panel HUD

Nouvel autoload QuestManager avec 11 templates (casser X sable, récolter
coraux, collecter perles, plonger à -25m, crafter 2 objets, etc.).
3 quêtes actives simultanément; complétion → récompense XP + roll d'une
nouvelle quête.

HUD: panneau "OBJECTIFS" top-right avec progression couleur (gris→vert),
bannière centrale "✓ QUÊTE" + son bulle au complete.

Motivation moyen-terme (5-15 min): le joueur a toujours qqch à faire.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/progression/QuestManager.gd

@@ -0,0 +1,107 @@
+extends Node
+
+# Short-term objectives that rotate. Each quest has:
+#   id (string), desc, kind (break/pearl/depth/craft), target (int), reward_xp (int)
+# Player always has up to MAX_ACTIVE quests active; completing one rolls a new one.
+
+signal quests_updated()
+signal quest_completed(quest: Dictionary)
+
+const MAX_ACTIVE: int = 3
+const QUEST_POOL: Array = [
+	{"id": "break_sand", "desc": "Casser 15 blocs de sable", "kind": "break", "item_id": 2, "target": 15, "reward_xp": 40},
+	{"id": "break_rock", "desc": "Casser 10 blocs de roche", "kind": "break", "item_id": 3, "target": 10, "reward_xp": 50},
+	{"id": "break_kelp", "desc": "Récolter 8 kelp", "kind": "break", "item_id": 6, "target": 8, "reward_xp": 35},
+	{"id": "break_coral_r", "desc": "Récolter 5 coraux rouges", "kind": "break", "item_id": 4, "target": 5, "reward_xp": 60},
+	{"id": "break_coral_b", "desc": "Récolter 5 coraux bleus", "kind": "break", "item_id": 5, "target": 5, "reward_xp": 60},
+	{"id": "find_wreck", "desc": "Fouiller 3 épaves", "kind": "break", "item_id": 7, "target": 3, "reward_xp": 80},
+	{"id": "pearl_3", "desc": "Collecter 3 perles", "kind": "pearl", "target": 3, "reward_xp": 70},
+	{"id": "pearl_5", "desc": "Collecter 5 perles", "kind": "pearl", "target": 5, "reward_xp": 110},
+	{"id": "depth_25", "desc": "Plonger à -25 m", "kind": "depth", "target": 25, "reward_xp": 50},
+	{"id": "depth_50", "desc": "Plonger à -50 m", "kind": "depth", "target": 50, "reward_xp": 90},
+	{"id": "craft_2", "desc": "Crafter 2 objets", "kind": "craft", "target": 2, "reward_xp": 45},
+]
+
+var active: Array = []  # each: Dictionary {template_ref, progress}
+var _used_ids: Array[String] = []
+
+
+func _ready() -> void:
+	_ensure_active_count()
+
+
+func _ensure_active_count() -> void:
+	while active.size() < MAX_ACTIVE:
+		var q: Dictionary = _pick_next_quest()
+		if q.is_empty():
+			break
+		active.append({
+			"id": q["id"],
+			"desc": q["desc"],
+			"kind": q["kind"],
+			"item_id": q.get("item_id", -1),
+			"target": q["target"],
+			"reward_xp": q["reward_xp"],
+			"progress": 0,
+		})
+	quests_updated.emit()
+
+
+func _pick_next_quest() -> Dictionary:
+	var candidates: Array = []
+	var active_ids: Array[String] = []
+	for q: Dictionary in active:
+		active_ids.append(q["id"])
+	for tpl: Dictionary in QUEST_POOL:
+		if active_ids.has(tpl["id"]):
+			continue
+		candidates.append(tpl)
+	if candidates.is_empty():
+		# all in use; allow recycle
+		_used_ids.clear()
+		candidates = QUEST_POOL
+	return candidates[randi() % candidates.size()]
+
+
+func note_block_break(block_id: int) -> void:
+	for q: Dictionary in active:
+		if q["kind"] == "break" and q["item_id"] == block_id:
+			_progress(q, 1)
+
+
+func note_pearl_collected() -> void:
+	for q: Dictionary in active:
+		if q["kind"] == "pearl":
+			_progress(q, 1)
+
+
+func note_craft() -> void:
+	for q: Dictionary in active:
+		if q["kind"] == "craft":
+			_progress(q, 1)
+
+
+func note_depth(depth_m: int) -> void:
+	for q: Dictionary in active:
+		if q["kind"] == "depth" and depth_m >= q["target"]:
+			q["progress"] = q["target"]
+			_check_complete(q)
+
+
+func _progress(q: Dictionary, amount: int) -> void:
+	q["progress"] = mini(q["progress"] + amount, q["target"])
+	_check_complete(q)
+	quests_updated.emit()
+
+
+func _check_complete(q: Dictionary) -> void:
+	if q["progress"] < q["target"]:
+		return
+	# Complete
+	var snapshot: Dictionary = q.duplicate()
+	quest_completed.emit(snapshot)
+	var pp: Node = get_node_or_null("/root/PlayerProgress")
+	if pp != null:
+		pp.award(q["reward_xp"], "quête: %s" % q["desc"], Vector3.ZERO)
+	active.erase(q)
+	_ensure_active_count()