Consolidate project documentation and attribution

Add public-alias credits and a tested in-game credits page, centralize project guidance and asset provenance, import the complete authored fur channel maps, and keep starter-island collision synchronized with imported props.

ui/title_credits_page.gd

@@ -0,0 +1,87 @@
+class_name TitleCreditsPage
+extends Control
+
+signal back_requested(restore_navigation_focus: bool)
+
+@onready var _paper: PanelContainer = %Paper
+@onready var _back_button: Button = %CreditsBackButton
+
+var _navigation_focus_active: bool = false
+
+
+func _ready() -> void:
+	UtilityPageStyle.apply_page(self)
+	_paper.add_theme_stylebox_override(
+		"panel", UtilityPageStyle.panel_style()
+	)
+	UtilityPageStyle.apply_ocean_button(_back_button)
+	_back_button.pressed.connect(_request_back)
+	hide()
+
+
+func open_page(use_navigation_focus: bool) -> void:
+	_navigation_focus_active = use_navigation_focus
+	show()
+	UtilityPageStyle.animate_in(self)
+	if use_navigation_focus:
+		call_deferred("_focus_back")
+	else:
+		_release_page_focus()
+
+
+func close_page() -> void:
+	_navigation_focus_active = false
+	_release_page_focus()
+	hide()
+	scale = Vector2.ONE
+	modulate.a = 1.0
+
+
+func handle_input(event: InputEvent) -> bool:
+	if not visible:
+		return false
+	if event is InputEventMouseMotion:
+		_navigation_focus_active = false
+		_release_page_focus()
+		return false
+	if event is InputEventKey and (event as InputEventKey).echo:
+		return false
+	var moves_focus: bool = (
+		event.is_action_pressed("ui_up")
+		or event.is_action_pressed("ui_down")
+		or event.is_action_pressed("ui_left")
+		or event.is_action_pressed("ui_right")
+	)
+	if moves_focus:
+		_navigation_focus_active = true
+		if not _page_has_focus():
+			_back_button.grab_focus()
+		return true
+	if event.is_action_pressed("ui_cancel"):
+		_request_back()
+		return true
+	return false
+
+
+func get_back_button() -> Button:
+	return _back_button
+
+
+func _focus_back() -> void:
+	if visible and _navigation_focus_active:
+		_back_button.grab_focus()
+
+
+func _request_back() -> void:
+	back_requested.emit(_navigation_focus_active)
+
+
+func _page_has_focus() -> bool:
+	var focus_owner: Control = get_viewport().gui_get_focus_owner()
+	return focus_owner != null and is_ancestor_of(focus_owner)
+
+
+func _release_page_focus() -> void:
+	var focus_owner: Control = get_viewport().gui_get_focus_owner()
+	if focus_owner != null and is_ancestor_of(focus_owner):
+		focus_owner.release_focus()