refactor: standardize app property names and improve TypeScript definitions

- Updated property names in AppCard.vue, AppDetailModal.vue, AppGrid.vue, and other components to use camelCase for consistency.
- Enhanced TypeScript definitions for props and emits in various components to improve type safety.
- Refactored download status handling in processInstall.ts to align with updated App interface.
- Improved error handling and type definitions in DownloadDetail.vue and related components.
- Added optional properties and refined existing interfaces in typedefinition.ts for better clarity and usability.

src/components/ThemeToggle.vue

@@ -12,17 +12,14 @@
   </button>
 </template>
 
-<script setup>
-import { defineProps, defineEmits } from 'vue';
+<script setup lang="ts">
+defineProps<{
+  isDark: boolean;
+}>();
 
-defineProps({
-  isDark: {
-    type: Boolean,
-    required: true
-  }
-});
-
-const emit = defineEmits(['toggle']);
+const emit = defineEmits<{
+  (e: 'toggle'): void;
+}>();
 
 const toggle = () => {
   emit('toggle');