[SeRazon]

概述

为非默认皮肤资源包增加导出功能，导出格式与导入格式完全一致（zip 压缩包）。

实现内容

• 在资源包列表的信息按钮左侧新增导出按钮（仅非默认资源包显示）
• 导出格式与导入格式完全一致：使用 compress_folder 将资源包目录压缩为 zip
• 导出流程复用谱面导出的 request_export / resolve_export / take_export 机制，支持系统文件选择器
• 导出文件名自动清理非法字符（/ \ : * ? " < > | → _）

按钮位置

导出按钮位于信息按钮左侧，与信息、删除按钮保持相同间距和样式：

改动文件

• phira/src/page/respack.rs：导出逻辑、按钮渲染、文件名清理
• phira/src/icons.rs：注册导出图标
• assets/export.png：导出图标资源

测试情况

• 编译通过
• 资源包导入功能正常（未受影响）
• 资源包导出功能正常，导出的 zip 可重新导入
• 默认资源包不显示导出按钮
• cargo fmt --all --check 通过

[Copilot]

Pull request overview

This PR adds an export capability for non-default resource packs, reusing the existing request_export / take_export / resolve_export flow so users can pick an output location and export a respack as an import-compatible .zip.

Changes:

• Add an export button to the respack UI (only for non-default packs) and hook it into the shared export workflow.
• Implement respack directory zipping via compress_folder and write the zip to the chosen export target.
• Register a new export icon texture in the global Icons loader.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 3 comments.

File	Description
phira/src/page/respack.rs	Adds export button UI + export task handling and filename sanitization.
phira/src/icons.rs	Registers export.png as a new Icons::export texture.
assets/export.png	New icon asset used by the export button.

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[YuevUwU]

Final Merged UI

Differs from the screenshot in the PR Description after "feat: adjust export button"

[SeRazon]

Final Merged UI

Differs from the screenshot in the PR Description after "feat: adjust export button"

Mivik changed the button position