fix: align archived habits on mobile

frontend/src/MvpPanel.vue

@@ -580,7 +580,7 @@ onBeforeUnmount(() => {
           </div>
         </article>
         <div v-if="!visibleHabits.length && !busy" class="empty-panel">{{ !showCompleted && habits.length ? '已完成的习惯已隐藏。' : '还没有习惯，从一件容易坚持的小事开始。' }}</div>
-        <button class="archived-toggle" type="button" @click="toggleArchivedHabits"><ArchiveRestore/>{{ archivedHabitsLoaded ? `已归档（${archivedHabits.length}）` : '已归档' }}</button>
+        <button class="archived-toggle habit-archive-toggle" type="button" @click="toggleArchivedHabits"><ArchiveRestore/>{{ archivedHabitsLoaded ? `已归档（${archivedHabits.length}）` : '已归档' }}</button>
         <div v-if="showArchivedHabits" class="archived-habits">
           <button v-for="h in archivedHabits" :key="h.id" type="button" @click="openHabitDetail(h, $event.currentTarget as HTMLElement)"><span>{{ h.name }}</span><small>查看详情</small></button>
           <p v-if="archivedHabitsLoaded && !archivedHabits.length && !busy" class="empty-panel">暂无已归档习惯。</p>

frontend/src/style.css

@@ -64,6 +64,7 @@ main{background:var(--surface-base)}
 .soft-button,.danger-button,.file-button,.secondary,.restore,.archived-toggle,.archived-countdowns button{background:var(--surface-raised);border-color:var(--border-cream);box-shadow:var(--highlight-inner)}
 .primary,.primary-small,.unified-fab{background:var(--accent);color:#fff}
 .danger-button{color:var(--danger);border-color:#dba99d;background:#fff8f5}.inline-error,.purge-list-error{color:var(--danger);background:#fff0ec}.task-check[aria-pressed="true"] .task-check-mark,.habit-row.done .habit-check .task-check-mark{background:var(--success);border-color:var(--success)}
+@media(max-width:930px){.habit-archive-toggle{width:100%;min-height:44px;appearance:none;background:var(--surface-raised);border:1px solid var(--border-cream);box-shadow:none;justify-content:flex-start}.archived-habits{width:100%;display:grid;gap:0}.archived-habits>button{width:100%;min-height:44px;appearance:none;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:12px;padding:10px 12px;color:inherit;text-align:left;background:var(--surface-raised);border:0;border-bottom:1px solid var(--border-cream);border-radius:0;font:inherit}.archived-habits>button span{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.archived-habits>button small{color:var(--muted);white-space:nowrap}}
 input,select,textarea,.search{background:var(--surface-raised);border-color:var(--border-cream);border-radius:var(--radius-control);box-shadow:var(--highlight-inner)}
 .search input,.detail-title textarea{background:transparent;box-shadow:none}
 .sidebar-popover button,.sidebar-action-sheet .app-sheet__body button,.app-sheet--actions .app-sheet__body>button,.more-sheet>button{background:var(--surface-raised)}

frontend/src/style.test.ts

@@ -228,7 +228,13 @@ describe('mobile list row language', () => {
   it('provides a minimal archived-habit viewing path', () => {
     expect(mvpPanel).toContain("request('/habits?archived=true')")
     expect(mvpPanel).toContain("{{ archivedHabitsLoaded ? `已归档（${archivedHabits.length}）` : '已归档' }}")
+    expect(mvpPanel).toContain('class="archived-toggle habit-archive-toggle"')
     expect(mvpPanel).toContain('v-for="h in archivedHabits"')
+    expect(css).toMatch(/@media\(max-width:930px\)\{\.habit-archive-toggle\{[^}]*width:100%;[^}]*min-height:44px;[^}]*appearance:none;[^}]*background:var\(--surface-raised\);[^}]*border:1px solid var\(--border-cream\)/)
+    expect(css).toMatch(/\.archived-habits\{[^}]*width:100%;[^}]*display:grid/)
+    expect(css).toMatch(/\.archived-habits>button\{[^}]*width:100%;[^}]*min-height:44px;[^}]*appearance:none;[^}]*grid-template-columns:minmax\(0,1fr\) auto;[^}]*background:var\(--surface-raised\);[^}]*border-bottom:1px solid var\(--border-cream\)/)
+    expect(css).toMatch(/\.archived-habits>button span\{[^}]*min-width:0;[^}]*overflow:hidden;[^}]*text-overflow:ellipsis;[^}]*white-space:nowrap/)
+    expect(css).toMatch(/\.archived-habits>button small\{[^}]*white-space:nowrap/)
   })
 
   it('reuses the habit composer for edits and patches only changed fields', () => {