Revert "feat: add calendar frontend"

This reverts commit af83a68fe1.

frontend/src/style.test.ts

@@ -118,16 +118,16 @@ describe('approved cream solid button system', () => {
 })
 
 describe('mobile navigation styles', () => {
-  it('uses five direct mobile destinations and keeps Settings in the sidebar', () => {
+  it('renames the bottom More tab to a direct Settings tab', () => {
     expect(app).not.toContain('aria-controls="mobile-more-menu"')
     expect(app).not.toContain('<Ellipsis/><span>更多</span>')
-    expect(app).toContain("<StickyNote/><span>备忘录</span>")
-    expect(app).toContain("<CalendarDays/><span>日历</span>")
-    expect(app).not.toContain("@click=\"switchView('settings')\"><Settings/><span>设置</span>")
+    expect(app).toContain("<Settings/><span>设置</span>")
+    expect(app).toContain("@click=\"switchView('settings')\"")
+    expect(app).toContain('<span>设置</span>')
   })
 
   it('marks only exact mobile destinations active and exposes aria-current only there', () => {
-    for (const view of ['today', 'habits', 'countdowns', 'memos', 'calendar']) {
+    for (const view of ['today', 'habits', 'countdowns', 'settings']) {
       expect(app).toContain(`:class="{active:activeView==='${view}'}" :aria-current="activeView==='${view}' ? 'page' : undefined"`)
     }
     expect(app).not.toContain("activeView==='tasks'||activeView==='upcoming'||activeView==='trash'||activeView==='settings'")