Fix mobile TypeScript errors and add package-lock.json

Fix tsconfig.json (remove rootDir/outDir, add noEmit), fix useRef
type error, fix navigation type cast, add @types/react-native-vector-icons,
and generate package-lock.json for CI.

mobile/package.json

@@ -36,6 +36,7 @@
     "@react-native/babel-preset": "^0.79.0",
     "@react-native/metro-config": "^0.79.0",
     "@types/react": "^19.0.0",
+    "@types/react-native-vector-icons": "^6.4.18",
     "typescript": "~5.7.0"
   }
 }

mobile/src/hooks/useOfflineDraft.ts

@@ -10,7 +10,7 @@ export function useOfflineDraft<T extends Record<string, unknown>>(
 ) {
   const [draft, setDraft] = useState<T>(initialData);
   const [isLoaded, setIsLoaded] = useState(false);
-  const saveTimeout = useRef<ReturnType<typeof setTimeout>>();
+  const saveTimeout = useRef<ReturnType<typeof setTimeout>>(null);
 
   useEffect(() => {
     AsyncStorage.getItem(DRAFT_KEY).then((stored) => {

mobile/src/screens/admin/ProposalWorkspaceScreen.tsx

@@ -207,7 +207,7 @@ export function ProposalWorkspaceScreen() {
               onPress={
                 !isLocked
                   ? () =>
-                      navigation.navigate('LineItemEdit' as never, {
+                      (navigation as any).navigate('LineItemEdit', {
                         proposalId,
                         lineItemId: item.id,
                         description: item.description,

mobile/tsconfig.json

@@ -9,8 +9,7 @@
     "skipLibCheck": true,
     "resolveJsonModule": true,
     "allowJs": true,
-    "outDir": "./dist",
-    "rootDir": ".",
+    "noEmit": true,
     "baseUrl": ".",
     "paths": {
       "@proposal-system/api-contracts": ["../shared/api-contracts/src"]