app-module events & callstack config, crash diagnostics (#630)

- Apps can specify task stack depth and preferred memory placement in their manifests.
- App identifiers are validated against length and character requirements.
- Crash diagnostics now show the crash cause, reason, fault address, call stack, and program-counter details, with logs saved for review.
- App closing is more consistent across built-in screens. There's now a dedicated function, and the old _emit() function is made private.
- Crash diagnostics no longer display a QR code without a call stack.
- Improved memory allocation for unrestricted requests.

Tactility/Source/app/fileselection/FileSelection.cpp

@@ -62,8 +62,7 @@ int32_t appMain(int argc, char* argv[]) {
         // app_manager_stop() after it receives the APP_EVENT_RESULT instead.
         lastPath = path;
         ctx.result = 0;
-        AppEvent closeEvent { .type = APP_EVENT_CLOSE, .timestamp = 0, .result = {} };
-        app_event_emit(appInstanceId, &closeEvent);
+        app_event_emit_close(appInstanceId);
     });
 
     TaskEventGroup event_group {};

Tactility/Source/app/fileselection/View.cpp

@@ -41,12 +41,7 @@ static void onNavigateUpPressedCallback(lv_event_t* event) {
 
 void View::onBackPressedCallback(lv_event_t* event) {
     auto* view = static_cast<View*>(lv_event_get_user_data(event));
-    // Async, non-blocking - must NOT call app_manager_stop() directly here: that bound-waits
-    // (thread_join) for this app's own thread to finish, which needs the LVGL lock
-    // (window_manager_remove()) - but this callback runs ON the LVGL task, which would
-    // deadlock against itself.
-    AppEvent closeEvent { .type = APP_EVENT_CLOSE, .timestamp = 0, .result = {} };
-    app_event_emit(view->appInstanceId, &closeEvent);
+    app_event_emit_close(view->appInstanceId);
 }
 
 void View::onTapFile(const std::string& path, const std::string& filename) {