enhance(frontend): タイムラインページのメニューから投稿フォームの表示有無を切り替えられるように

packages/frontend/src/pages/timeline.vue

@@ -103,6 +103,8 @@ const withSensitive = computed<boolean>({
 	set: (x) => saveTlFilter('withSensitive', x),
 });
 
+const showFixedPostForm = prefer.model('showFixedPostForm');
+
 async function chooseList(ev: MouseEvent): Promise<void> {
 	const lists = await userListsCache.fetch();
 	const items: (MenuItem | undefined)[] = [
@@ -202,8 +204,7 @@ onActivated(() => {
 });
 
 const headerActions = computed(() => {
-	const tmp = [
-		{
+	const items = [{
 		icon: 'ti ti-dots',
 		text: i18n.ts.options,
 		handler: (ev) => {
@@ -237,14 +238,20 @@ const headerActions = computed(() => {
 				text: i18n.ts.fileAttachedOnly,
 				ref: onlyFiles,
 				disabled: isBasicTimeline(src.value) && hasWithReplies(src.value) ? withReplies : false,
+			}, {
+				type: 'divider',
+			}, {
+				type: 'switch',
+				text: i18n.ts.showFixedPostForm,
+				ref: showFixedPostForm,
 			});
 
 			os.popupMenu(menuItems, ev.currentTarget ?? ev.target);
 		},
-		},
-	];
+	}];
+
 	if (deviceKind === 'desktop') {
-		tmp.unshift({
+		items.unshift({
 			icon: 'ti ti-refresh',
 			text: i18n.ts.reload,
 			handler: (ev: Event) => {
@@ -252,7 +259,8 @@ const headerActions = computed(() => {
 			},
 		});
 	}
-	return tmp;
+
+	return items;
 });
 
 const headerTabs = computed(() => [...(prefer.r.pinnedUserLists.value.map(l => ({