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/apphub/AppHubApp.cpp

@@ -12,6 +12,7 @@
 #include <Tactility/service/wifi/Wifi.h>
 
 #include <lvgl.h>
+#include <tactility/lvgl_symbols_shared.h>
 #include <algorithm>
 #include <format>
 
@@ -178,6 +179,7 @@ public:
 extern const AppManifest manifest = {
     .appId = "AppHub",
     .appName = "App Hub",
+    .appIcon = LVGL_SYMBOL_HUB,
     .appCategory = Category::System,
     .createApp = create<AppHubApp>,
 };