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/files/FilesApp.cpp

@@ -39,7 +39,6 @@ public:
 extern const AppManifest manifest = {
     .appId = "Files",
     .appName = "Files",
-    .appIcon = TT_ASSETS_APP_ICON_FILES,
     .appCategory = Category::System,
     .appFlags = AppManifest::Flags::Hidden,
     .createApp = create<FilesApp>