DashBoard/openspec/changes/reject-history-ui-polish/tasks.md

1. Quick visual fixes (no component extraction needed)

• 1.1 Add tbody tr:hover background rule to style.css for .detail-table and .pareto-table
• 1.2 Localize pagination: change "Prev" → "上一頁", "Next" → "下一頁", "Page X / Y · Total Z" → "第 X / Y 頁 · 共 Z 筆"
• 1.3 Add loading overlay + spinner after .dashboard div (<div v-if="loading.initial" class="loading-overlay">)
• 1.4 Add "重新整理" button in header-right area, wired to applyFilters
• 1.5 Remove duplicated MultiSelect CSS (~120 lines of .multi-select-* rules) from style.css; verify MultiSelect still renders correctly

2. Extract sub-components from App.vue

• 2.1 Create components/FilterPanel.vue — extract filter grid, checkbox row, action buttons, and active-filter chips section; props: filters, options, loading, activeFilterChips; emits: apply, clear, remove-chip, export-csv, pareto-scope-toggle
• 2.2 Create components/SummaryCards.vue — extract .summary-row section; props: cards
• 2.3 Create components/TrendChart.vue — extract trend chart .card section with ECharts registration and chart option computed internally; props: items, loading
• 2.4 Create components/ParetoSection.vue — extract pareto chart + table .card section with ECharts registration and chart option computed internally; props: items, detailReason, loading; emits: reason-click
• 2.5 Create components/DetailTable.vue — extract detail table + pagination; props: items, pagination, loading; emits: go-to-page

3. Rewire App.vue as orchestrator

• 3.1 Replace inline template sections with sub-component tags, passing props and wiring emits
• 3.2 Move ECharts use() registration and chart computed properties into their respective chart components
• 3.3 Verify all interactions work: filter apply/clear, pareto click → detail filter, pagination, CSV export, refresh button

4. Verify and build

• 4.1 Run vite build and confirm no compilation errors
• 4.2 Visually verify: loading overlay, table hover, Chinese pagination, refresh button, pareto interaction, filter chips