feat: file-based config system + fix dashboard background rendering

autoload/config_manager.gd

@@ -3,21 +3,77 @@ extends Node
 
 signal config_changed(key: String, value: Variant)
 
-var _settings: Dictionary = {
-    "refresh_interval": 1.0,
-    "show_cpu": true,
-    "show_memory": true,
-    "show_network": true,
-    "show_disk": true,
-    "theme": "default",
-}
+var _settings: Dictionary = {}
+
+
+func _ready() -> void:
+	_load_config()
 
 
 func get_setting(key: String, default_value: Variant = null) -> Variant:
-    return _settings.get(key, default_value)
+	return _settings.get(key, default_value)
 
 
 func set_setting(key: String, value: Variant) -> void:
-    if _settings.has(key) and _settings[key] != value:
-        _settings[key] = value
-        config_changed.emit(key, value)
+	if _settings.has(key) and _settings[key] != value:
+		_settings[key] = value
+		_save_user_config()
+		config_changed.emit(key, value)
+
+
+## Parse a "r, g, b" string from config into a Color with alpha 1.0.
+func get_color(key: String, default_color: Color = Color.WHITE) -> Color:
+	var raw: Variant = _settings.get(key)
+	if raw == null or typeof(raw) != TYPE_STRING:
+		return default_color
+	var parts: PackedStringArray = (raw as String).split(",", false)
+	if parts.size() < 3:
+		return default_color
+	var r: float = parts[0].strip_edges().to_float()
+	var g: float = parts[1].strip_edges().to_float()
+	var b: float = parts[2].strip_edges().to_float()
+	return Color(r, g, b, 1.0)
+
+
+func _load_config() -> void:
+	# Load defaults, then overlay user config.
+	var defaults := _read_json_file("res://config/default.json")
+	var user := _read_json_file("res://config/config.json")
+
+	_settings.clear()
+	if defaults != null and defaults is Dictionary:
+		_merge_dict(_settings, defaults as Dictionary)
+	if user != null and user is Dictionary:
+		_merge_dict(_settings, user as Dictionary)
+
+
+static func _read_json_file(path: String) -> Variant:
+	var file := FileAccess.open(path, FileAccess.READ)
+	if file == null:
+		return null
+	var content: String = file.get_as_text()
+	var parsed: Variant = JSON.parse_string(content)
+	return parsed
+
+
+static func _merge_dict(dst: Dictionary, src: Dictionary) -> void:
+	for key in src:
+		dst[key] = src[key]
+
+
+func _save_user_config() -> void:
+	# Only persists settings that differ from defaults.
+	var defaults := _read_json_file("res://config/default.json")
+	if not (defaults is Dictionary):
+		return
+
+	var diff: Dictionary = {}
+	for key in _settings:
+		if not defaults.has(key) or defaults[key] != _settings[key]:
+			diff[key] = _settings[key]
+
+	var path: String = "res://config/config.json"
+	var json_str: String = JSON.stringify(diff, "\t")
+	var file := FileAccess.open(path, FileAccess.WRITE)
+	if file != null:
+		file.store_string(json_str)