Add custom icon fonts to lvgl-module (#499)

* **New Features**
  * Added Material Design symbol fonts and LVGL font aliases for launcher, status bar, and shared UI icons.

* **Style**
  * Migrated app icons across the UI to the new symbol font system.
  * Updated launcher button sizing, font styling, recoloring and icon text color for consistency.
  * Default text/icon font macros set for consistent sizing across the UI.

* **Documentation**
  * Updated third‑party notices to include Material Design Icons links.

Tactility/Source/app/power/Power.cpp

@@ -6,8 +6,9 @@
 
 #include <Tactility/hal/power/PowerDevice.h>
 #include <Tactility/Timer.h>
-#include <Tactility/Assets.h>
+
 #include <tactility/hal/Device.h>
+#include <tactility/lvgl_symbols_shared.h>
 
 #include <lvgl.h>
 
@@ -191,7 +192,7 @@ public:
 extern const AppManifest manifest = {
     .appId = "Power",
     .appName = "Power",
-    .appIcon = TT_ASSETS_APP_ICON_POWER_SETTINGS,
+    .appIcon = LVGL_SYMBOL_ELECTRIC_BOLT,
     .appCategory = Category::Settings,
     .createApp = create<PowerApp>
 };