feat: 添加结算功能并优化界面

- 新增结算历史页面，支持查看历史结算记录和排行榜
- 实现结算功能，可将当前积分记录归档并清零学生分数
- 优化学生搜索功能，支持拼音匹配
- 更新应用图标和品牌标识
- 改进主题系统，支持自定义侧边栏文本颜色
- 重构积分管理表单，优化用户体验
- 修复若干已知问题并改进代码结构

src/main/repos/SettlementRepository.ts

@@ -0,0 +1,102 @@
+import { Database } from 'better-sqlite3'
+
+export interface SettlementSummary {
+  id: number
+  start_time: string
+  end_time: string
+  event_count: number
+}
+
+export interface SettlementLeaderboardRow {
+  name: string
+  score: number
+}
+
+export class SettlementRepository {
+  constructor(private db: Database) {}
+
+  findAll(): SettlementSummary[] {
+    const rows = this.db
+      .prepare(
+        `
+      SELECT
+        s.id as id,
+        s.start_time as start_time,
+        s.end_time as end_time,
+        (
+          SELECT COUNT(1)
+          FROM score_events e
+          WHERE e.settlement_id = s.id
+        ) as event_count
+      FROM settlements s
+      ORDER BY julianday(s.end_time) DESC
+    `
+      )
+      .all() as SettlementSummary[]
+    return rows
+  }
+
+  settleNow() {
+    return this.db.transaction(() => {
+      const unassigned = this.db
+        .prepare(`SELECT COUNT(1) as count FROM score_events WHERE settlement_id IS NULL`)
+        .get() as { count: number }
+
+      const eventCount = Number(unassigned?.count ?? 0)
+      if (eventCount <= 0) {
+        throw new Error('暂无可结算记录')
+      }
+
+      const endTime = new Date().toISOString()
+      const lastSettlement = this.db
+        .prepare(`SELECT end_time FROM settlements ORDER BY julianday(end_time) DESC LIMIT 1`)
+        .get() as { end_time: string } | undefined
+
+      const minEvent = this.db
+        .prepare(`SELECT MIN(event_time) as min_time FROM score_events WHERE settlement_id IS NULL`)
+        .get() as { min_time: string } | undefined
+
+      const startTime = lastSettlement?.end_time || minEvent?.min_time || endTime
+
+      const info = this.db
+        .prepare(`INSERT INTO settlements (start_time, end_time) VALUES (?, ?)`)
+        .run(startTime, endTime)
+      const settlementId = info.lastInsertRowid as number
+
+      this.db
+        .prepare(`UPDATE score_events SET settlement_id = ? WHERE settlement_id IS NULL`)
+        .run(settlementId)
+
+      this.db.prepare(`UPDATE students SET score = 0, updated_at = CURRENT_TIMESTAMP`).run()
+
+      return { settlementId, startTime, endTime, eventCount }
+    })()
+  }
+
+  getLeaderboard(settlementId: number) {
+    const settlement = this.db
+      .prepare(`SELECT id, start_time, end_time FROM settlements WHERE id = ?`)
+      .get(settlementId) as { id: number; start_time: string; end_time: string } | undefined
+
+    if (!settlement) {
+      throw new Error('结算记录不存在')
+    }
+
+    const rows = this.db
+      .prepare(
+        `
+      SELECT
+        e.student_name as name,
+        COALESCE(SUM(e.delta), 0) as score
+      FROM score_events e
+      WHERE e.settlement_id = ?
+      GROUP BY e.student_name
+      ORDER BY score DESC, name ASC
+    `
+      )
+      .all(settlementId) as SettlementLeaderboardRow[]
+
+    return { settlement, rows }
+  }
+}
+