fix(tools): 自定义下载页加载时刷新按钮状态，避免下载按钮一直置灰

[NoClassFoundError]

PageToolsTest 的 MeLoaded 在加载时将 BtnDownloadStart 置为禁用，但既未校验 TextDownloadUrl，也未调用真正计算按钮启用状态的 StartButtonRefresh，导致下载按钮初始一直灰色、需手动改动下载地址（触发 ValidatedTextChanged→StartButtonRefresh）才会恢复。
在 MeLoaded 末尾补上TextDownloadUrl.Validate() 与 StartButtonRefresh()，使按钮在加载时即按 URL/文件夹/文件名三项校验结果正确启用/禁用。

resolves #3350

本PR的提交信息生成由Claude Code Opus 4.8生成，由Opus 4.8对代码进行了审查。

Summary by Sourcery

Bug Fixes:

• 确保在初始加载时，根据 URL、文件夹和文件名的校验结果正确启用或禁用下载按钮，而不是在 URL 字段被编辑之前一直保持禁用状态。

Original summary in English

Summary by Sourcery

Bug Fixes:

• Ensure the download button is correctly enabled or disabled on initial load based on URL, folder, and filename validation instead of remaining disabled until the URL field is edited.

[sourcery-ai]

审阅者指南（在小型 PR 上折叠）

审阅者指南

通过在 MeLoaded 期间验证下载 URL 并运行现有的开始按钮刷新逻辑，确保工具测试页面在加载时正确初始化下载按钮的启用/禁用状态。

MeLoaded 初始化下载按钮状态的时序图

sequenceDiagram
    actor User
    participant PageToolsTest
    participant TextDownloadFolder
    participant TextDownloadName
    participant TextDownloadUrl
    participant BtnDownloadStart

    User->>PageToolsTest: MeLoaded()
    PageToolsTest->>TextDownloadFolder: Validate()
    PageToolsTest->>TextDownloadName: Validate()
    PageToolsTest->>TextDownloadUrl: Validate()
    PageToolsTest->>PageToolsTest: StartButtonRefresh()
    PageToolsTest->>BtnDownloadStart: [update IsEnabled based on validations]

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文件级变更

变更	细节	文件
修复初始下载按钮状态，使其在工具测试页面加载时能反映当前输入校验结果。	扩展 MeLoaded，在校验文件夹和名称字段的同时，额外校验下载 URL。 在 MeLoaded 末尾调用 StartButtonRefresh，使下载按钮的启用状态根据当前校验结果重新计算。	Plain Craft Launcher 2/Pages/PageTools/PageToolsTest.xaml.cs

与关联 issue 的对照评估

Issue	目标	是否解决	说明
#3350	修复自定义下载工具页面上自定义下载按钮保持灰色且无法点击的 bug，即便已经提供了有效的下载信息。	✅

可能关联的 issue

• [C#]: 自定义下载按钮灰色无法下载 #3350：PR 在加载时校验 URL 并刷新按钮状态，修复了自定义下载按钮保持灰/禁用的问题。

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Original review guide in English

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Ensures the tools test page initializes the download button enabled/disabled state correctly on load by validating the download URL and running the existing start-button refresh logic during MeLoaded.

Sequence diagram for MeLoaded initializing download button state

sequenceDiagram
    actor User
    participant PageToolsTest
    participant TextDownloadFolder
    participant TextDownloadName
    participant TextDownloadUrl
    participant BtnDownloadStart

    User->>PageToolsTest: MeLoaded()
    PageToolsTest->>TextDownloadFolder: Validate()
    PageToolsTest->>TextDownloadName: Validate()
    PageToolsTest->>TextDownloadUrl: Validate()
    PageToolsTest->>PageToolsTest: StartButtonRefresh()
    PageToolsTest->>BtnDownloadStart: [update IsEnabled based on validations]

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File-Level Changes

Change	Details	Files
Fix initial download button state so it reflects current input validation when the tools test page loads.	Extend MeLoaded to validate the download URL in addition to folder and name fields. Invoke StartButtonRefresh at the end of MeLoaded so the download button enablement is recalculated based on current validation results.	Plain Craft Launcher 2/Pages/PageTools/PageToolsTest.xaml.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#3350	Fix the bug where the custom download button remains greyed out and cannot be clicked on the custom download tools page, even when valid download information is provided.	✅

Possibly linked issues

• [C#]: 自定义下载按钮灰色无法下载 #3350: PR validates URL and refreshes button state on load, fixing the custom download button staying grey/disabled.

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[sourcery-ai]

Hey - 我已经审查了你的更改，看起来非常不错！

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Original comment in English

Hey - I've reviewed your changes and they look great!

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