add cpu module with /proc/stat collector, visible grid cells, dark background, and fullscreen dashboard

scenes/dashboard.gd

@@ -3,6 +3,36 @@ extends Control
 
 @onready var grid: DashboardGrid = %DashboardGrid
 
+var _modules: Array = []
+
 
 func _ready() -> void:
     get_window().mode = Window.MODE_FULLSCREEN
+    _set_background()
+    _add_modules()
+
+
+func _set_background() -> void:
+    var bg := StyleBoxFlat.new()
+    bg.bg_color = Color(0.08, 0.08, 0.12, 1.0)
+    add_theme_stylebox_override("panel", bg)
+
+
+func _add_modules() -> void:
+    var cpu := preload("res://panels/cpu/cpu_module.tscn").instantiate()
+    grid.place_module(cpu, 0, 0)
+    _modules.append(cpu)
+
+    # Start a timer to refresh all modules every second
+    var timer := Timer.new()
+    timer.timeout.connect(_refresh_modules)
+    timer.autostart = true
+    timer.wait_time = 1.0
+    add_child(timer)
+
+
+func _refresh_modules() -> void:
+    var data: Dictionary = {}
+    for mod in _modules:
+        if is_instance_valid(mod) and mod.has_method("refresh"):
+            mod.refresh(data)