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/trackball/TrackballSettings.cpp

@@ -3,11 +3,12 @@
 #include <Tactility/Tactility.h>
 
 #include <Tactility/settings/TrackballSettings.h>
-#include <Tactility/Assets.h>
 #include <Tactility/lvgl/Toolbar.h>
 
 #include <lvgl.h>
 
+#include <tactility/lvgl_symbols_shared.h>
+
 // Forward declare driver functions
 namespace trackball {
     void setEnabled(bool enabled);
@@ -209,7 +210,7 @@ public:
 extern const AppManifest manifest = {
     .appId = "TrackballSettings",
     .appName = "Trackball",
-    .appIcon = TT_ASSETS_APP_ICON_SETTINGS,
+    .appIcon = LVGL_SYMBOL_CIRCLE,
     .appCategory = Category::Settings,
     .createApp = create<TrackballSettingsApp>
 };