feat: add calendar frontend

frontend/src/CalendarIntegration.test.ts

@@ -0,0 +1,8 @@
+import { readFileSync } from 'node:fs'
+import { describe,expect,it } from 'vitest'
+const app=readFileSync('src/App.vue','utf8');const utils=readFileSync('src/lib/mvp-utils.ts','utf8');const css=readFileSync('src/calendar.css','utf8')
+describe('calendar shell integration',()=>{
+ it('puts calendar beside the other first-level tools on desktop and mobile',()=>{const nav=app.slice(app.indexOf('<nav class="primary-nav">'),app.indexOf('</nav>',app.indexOf('<nav class="primary-nav">')));expect(nav.indexOf("switchView('habits')")).toBeLessThan(nav.indexOf("switchView('countdowns')"));expect(nav.indexOf("switchView('countdowns')")).toBeLessThan(nav.indexOf("switchView('memos')"));expect(nav.indexOf("switchView('memos')")).toBeLessThan(nav.indexOf("switchView('calendar')"));const bottom=app.slice(app.indexOf('<nav class="bottom"'),app.indexOf('</nav>',app.indexOf('<nav class="bottom"')));for(const view of ['today','habits','countdowns','memos','calendar'])expect(bottom).toContain(`switchView('${view}')`);expect(bottom).not.toContain("switchView('settings')")})
+ it('persists calendar navigation and mounts the panel',()=>{expect(utils).toContain("'calendar'");expect(app).toContain("import CalendarPanel from './CalendarPanel.vue'");expect(app).toContain("activeView==='calendar'")})
+ it('keeps five 44px mobile targets across required breakpoints',()=>{const shellCss=readFileSync('src/style.css','utf8');expect(shellCss).toContain('grid-template-columns:repeat(5,minmax(0,1fr))');expect(css).toContain('min-height:44px');expect(css).toContain('@media(max-width:720px)');expect(css).toContain('@media(min-width:931px)');expect(css).toContain('@media(min-width:1440px)')})
+})