refactor(frontend): reduce type errors

packages/frontend/src/components/MkWindow.vue

@@ -143,6 +143,7 @@ function top() {
 }
 
 function maximize() {
+	if (rootEl.value == null) return;
 	maximized.value = true;
 	unResizedTop = rootEl.value.style.top;
 	unResizedLeft = rootEl.value.style.left;
@@ -155,6 +156,7 @@ function maximize() {
 }
 
 function unMaximize() {
+	if (rootEl.value == null) return;
 	maximized.value = false;
 	rootEl.value.style.top = unResizedTop;
 	rootEl.value.style.left = unResizedLeft;
@@ -163,6 +165,7 @@ function unMaximize() {
 }
 
 function minimize() {
+	if (rootEl.value == null) return;
 	minimized.value = true;
 	unResizedWidth = rootEl.value.style.width;
 	unResizedHeight = rootEl.value.style.height;
@@ -171,8 +174,8 @@ function minimize() {
 }
 
 function unMinimize() {
+	if (rootEl.value == null) return;
 	const main = rootEl.value;
-	if (main == null) return;
 
 	minimized.value = false;
 	rootEl.value.style.width = unResizedWidth;

packages/frontend/src/pages/settings/drive.vue

@@ -84,6 +84,7 @@ const alwaysMarkNsfw = ref($i.alwaysMarkNsfw);
 const autoSensitive = ref($i.autoSensitive);
 
 const meterStyle = computed(() => {
+	if (!capacity.value || !usage.value) return {};
 	return {
 		width: `${usage.value / capacity.value * 100}%`,
 		background: tinycolor({