feat: add growth tracking page and related functionality

- Implemented a new Growth page to track practice time and trends.
- Added API integration for fetching review data.
- Created components for displaying practice statistics and trends.
- Updated navigation titles for the main index and growth pages.
- Removed unused styles from the index page.
- Introduced a Projects management page for adding and editing practice projects.
- Developed a Record form for logging practice sessions with validation.
- Added utility functions for date manipulation and duration formatting.
- Implemented error handling and session management in the practice service.
- Created unit tests for the practice service to ensure reliability.

AGENTS.md

@@ -9,3 +9,16 @@
 
 修改小程序后，在 `miniprogram/` 执行 `pnpm typecheck` 和 `pnpm build`。修改后端后，在 `backend/` 执行 `go vet ./...`、`go test -race ./...` 和 `go build -o bin/api ./cmd/server`；部署配置变更另需检查 Compose 和镜像构建。仅报告实际执行的验证。
 
+## Agent skills
+
+### Issue tracker
+
+任务使用本地 Markdown 跟踪；读写事项或规格前，先读 `docs/agents/issue-tracker.md`。
+
+### Triage labels
+
+采用默认的五个分流标签；分流事项前，先读 `docs/agents/triage-labels.md`。
+
+### Domain docs
+
+采用 single-context 布局；探索代码库前，先读 `docs/agents/domain.md`。