Improve Logbook presentation

ui/logbook_catalog.gd

@@ -16,6 +16,44 @@ const CATALOG_ORDER: Array[StringName] = [
 	&"catfish_white",
 ]
 
+# Short presentation notes are kept here with the catalog contract rather
+# than mixed into gameplay balance resources. Add facts deliberately when a
+# species joins the catalog.
+const FISH_FACTS: Dictionary[StringName, String] = {
+	&"bluegill": (
+		"bluegill fathers sweep shallow bowls into the bottom for nests, "
+		+ "then stand guard. whole neighborhoods of nests can crowd together."
+	),
+	&"bass": (
+		"striped bass split their lives between salt and fresh water, "
+		+ "returning upriver to spawn. a long-lived striper may see three decades."
+	),
+	&"carp": (
+		"whisker-like barbels help a common carp investigate the bottom. "
+		+ "nosing through sediment can cloud the water and loosen plants."
+	),
+	&"sunfish": (
+		"ocean sunfish are built more like enormous swimming heads than "
+		+ "ordinary fish. they visit the surface and turn sideways to warm up."
+	),
+	&"catfish_blue": (
+		"a deep fork in the tail inspired the blue catfish's scientific "
+		+ "name. it rests deep by daylight and becomes more active after dark."
+	),
+	&"catfish_channel": (
+		"a channel catfish can taste through skin all over its body, "
+		+ "especially near its gills and whiskers. the male watches the eggs."
+	),
+	&"catfish_flathead": (
+		"flatheads favor hideouts made by logs, rocks, ledges, and other "
+		+ "underwater structure. as they grow, fish dominate their menu."
+	),
+	&"catfish_white": (
+		"white catfish began along the atlantic coast between new york "
+		+ "and florida. people later carried them far beyond that home range."
+	),
+}
+
 static func category_for(fish: FishDataType) -> WaterType.Type:
 	if fish == null:
 		return WaterType.Type.OTHER
@@ -41,6 +79,10 @@ static func catalog_number(fish_id: StringName) -> int:
 	return index + 1 if index >= 0 else 0
 
 
+static func facts_for(fish_id: StringName) -> String:
+	return str(FISH_FACTS.get(fish_id, "unknown"))
+
+
 static func ordered_species(
 	candidates: Array[FishDataType],
 ) -> Array[FishDataType]: