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/chat/ChatApp.cpp

@@ -8,13 +8,13 @@
 #include <Tactility/app/chat/ChatProtocol.h>
 
 #include <Tactility/app/AppManifest.h>
-#include <Tactility/Assets.h>
 #include <Tactility/Logger.h>
 #include <Tactility/lvgl/LvglSync.h>
 
 #include <algorithm>
 #include <cctype>
 #include <cstdlib>
+#include <tactility/lvgl_symbols_shared.h>
 #include <vector>
 
 namespace tt::app::chat {
@@ -181,7 +181,7 @@ void ChatApp::switchChannel(const std::string& chatChannel) {
 extern const AppManifest manifest = {
     .appId = "Chat",
     .appName = "Chat",
-    .appIcon = TT_ASSETS_APP_ICON_CHAT,
+    .appIcon = LVGL_SYMBOL_FORUM,
     .createApp = create<ChatApp>
 };