feat(app-iced): M109 CONTENTDL —— 内容库页（整合包/Mod/资源包/光影）
用户令「下载页只负责下载整合包和Mod/光影」：新开一页做**内容发现与装入**，
检索走 Modrinth（优先，无需 key）/ CurseForge（`ULL_CF_API_KEY` 环境变量，日志只打
set/unset），装入走 core 的下载引擎真下到实例目录，进度/取消/失败复用下载页那块安装面板。
- **入口（B1）**：`Route::Content` 是新顶层路由，但 `Route::nav()` 复用 `NavSection::Download`
——导航轨仍五项，页头右上是「版本管理 | 内容库」一级切换（版本管理页也加了同一个切换，
否则内容库只有 `ULL_START_ROUTE` 能到）
- **页内四条一级侧栏**（`pages/content/layout.rs` 四档几何：992/856/648 三个门槛都是
「Σ栏宽 + 间距」算出来的）：整合包 / Mod / 资源包 / 光影；标签栏 200（`Resource packs`
比 M107 的版本类型名长，140 会切字，已登记偏离）
- **筛选**：关键词（草稿 + 显式「搜索」按钮，不逐字打网络）、来源、游戏版本、加载器
（Fabric/Forge/NeoForge/Quilt）、排序；**分页**（「加载更多」）而不是无限滚动——快照只有一个槽、
翻页要看得见、状态要可截图复现
- **四态**：加载 / 空 / 失败 / 有数据 + 「没有更多了」；筛选条在任何状态下都在（加载中藏筛选条
等于把入口收走）
- **一键装入**：`Content::blockers()` 是纯函数——版本不匹配、加载器不匹配、没有目标实例、
整合包缺管线**四条原因逐条**给出，按钮点之前就禁用；判定与画法分开（model/tests 直接钉）
- **整合包今天不可装**：`ContentKind::Modpack.dir()` 是 `None`，UI 禁用 + 说明，host 侧再挡
一次（绕过 UI 也只会回一条 Failed）。真流程是 M111 的导入管线
- **零 UI 网络**：`presenter/host/addon.rs` + `addon/{sources,http,install}.rs`；无 header 的请求走
core 的 `download_bytes`（信号量限流 + 健康度 + 退避全现成），带 `X-API-KEY` 的只有 CF 一条，
自带 429/5xx 退避（优先吃 `Retry-After`，封顶 30s）；密钥不进 DTO/日志/仓库
- 文案 41 条中英进 `crates/i18n`（新域接在装配链末尾 ⇒ `Key::ALL` 与金表只追加）
- 演示数据 `ContentHit → Hit::of` 与产品路径同源（格式化不会两套），`ULL_CONTENT_KIND` /
`ULL_CONTENT_STATE` 供出图矩阵选类型与状态
取证：`DevDocs/artifacts/m109/`（10 张：四类内容 × 浅/深 + 搜索无结果 + 加载器不兼容禁用）
门禁：fmt ✓ / clippy `-D warnings`（三 crate）✓ / app-iced 450+6、presenter 170、i18n 24 全绿；
`cargo tree` 两条零 UI 门禁仍空；全部改动文件 ≤400 行。
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//! 详情面板：选中项的支持范围 + 目标实例 + 装入（不兼容时**禁用并逐条给原因**）。
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//!
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//! 从 `pages/content/parts.rs` 拆出（那个文件已贴 400 行硬上限）。
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//!
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//! 这块是「一键装入指定实例」的**唯一**入口：按钮能不能按由 [`Content::can_install`] 决定，
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//! 按不动时旁边逐条列出原因——判定与画法分开，`model/tests.rs` 才能不开图形环境就钉住它。
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use iced::widget::{column, container};
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use iced::{Element, Length};
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use unlucky_design::color::Role;
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use unlucky_design::icons::IconKind;
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use unlucky_design::spacing::Space;
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use unlucky_design::typography::TypeRole;
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use unlucky_i18n::{Catalog, Key};
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use crate::app::components::buttons::{self, Button};
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use crate::app::components::divider;
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use crate::app::components::selection::{chip, Chip};
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use crate::theme::Ui;
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use super::super::model::{capitalize, Content};
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use super::super::Message as ContentMessage;
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use super::{intent, labelled};
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use crate::pages::frame;
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use crate::pages::Message as PageMessage;
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/// 详情面板：选中项的支持范围 + 目标实例 + 装入（不兼容时**禁用并给原因**）。
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pub(crate) fn detail<'a>(
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ui: &'a Ui,
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catalog: Catalog,
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model: &'a Content,
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) -> Element<'a, PageMessage> {
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let Some(hit) = model.selected_hit() else {
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return container(frame::text_role(
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ui,
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TypeRole::BodySmall,
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false,
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catalog.text(Key::ContentDetailEmpty),
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ui.color(Role::OnSurfaceVariant),
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))
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.width(Length::Fill)
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.into();
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};
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let head = column![
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frame::text_role(
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ui,
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TypeRole::TitleMedium,
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true,
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hit.title.as_str(),
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ui.color(Role::OnSurface)
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),
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frame::text_role(
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ui,
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TypeRole::BodySmall,
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false,
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hit.supporting.as_str(),
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ui.color(Role::OnSurfaceVariant),
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),
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frame::text_role(
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ui,
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TypeRole::BodySmall,
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false,
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hit.summary.as_str(),
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ui.color(Role::OnSurfaceVariant),
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),
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]
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.spacing(ui.space(Space::X1))
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.width(Length::Fill);
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let meta = column![
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frame::text_role(
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ui,
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TypeRole::LabelMedium,
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false,
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hit.downloads.as_str(),
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ui.color(Role::OnSurfaceVariant)
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),
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frame::text_role(
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ui,
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TypeRole::LabelMedium,
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false,
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hit.updated.as_str(),
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ui.color(Role::OnSurfaceVariant)
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),
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support_line(ui, catalog, Key::ContentDetailVersions, &hit.versions),
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support_line(ui, catalog, Key::ContentDetailLoaders, &hit.loaders),
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]
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.spacing(ui.space(Space::X1))
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.width(Length::Fill);
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let mut body = column![head, divider::full(ui), meta].spacing(ui.space(Space::X3));
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// 目标实例：一行 chip（选中的那个高亮）
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if model.targets.is_empty() {
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body = body.push(frame::text_role(
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ui,
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TypeRole::BodySmall,
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false,
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catalog.text(Key::ContentNoInstances),
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ui.color(Role::OnSurfaceVariant),
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));
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} else {
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let mut targets = Vec::new();
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for target in &model.targets {
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targets.push(chip(
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ui,
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Chip::filter(
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target.name.as_str(),
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model.target.as_deref() == Some(target.id.as_str()),
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intent(ContentMessage::SetTarget(target.id.clone())),
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),
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));
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}
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body = body.push(labelled(
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ui,
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catalog.text(Key::ContentTargetInstance),
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targets,
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));
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}
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// 装入：能装 ⇒ 实心按钮；不能 ⇒ 禁用 + 逐条原因（**点之前**就说清楚）
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if model.can_install() {
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body = body.push(buttons::filled(
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ui,
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Button::new(
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catalog.text(Key::ContentInstall),
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intent(ContentMessage::Install),
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)
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.leading(IconKind::Download),
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));
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} else {
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body = body.push(buttons::outlined(
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ui,
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Button::disabled(catalog.text(Key::ContentInstall)),
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));
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for reason in model.blocker_reasons(catalog) {
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body = body.push(frame::text_role_owned(
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ui,
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TypeRole::BodySmall,
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false,
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reason,
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ui.color(Role::OnSurfaceVariant),
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));
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}
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}
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container(body.spacing(ui.space(Space::X3)))
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.width(Length::Fill)
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.into()
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}
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/// 「游戏版本：1.20.1, 1.20.4」一行（空列表给 `—`，不编造）。
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fn support_line<'a>(
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ui: &'a Ui,
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catalog: Catalog,
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key: Key,
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values: &[String],
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) -> Element<'a, PageMessage> {
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let list = if values.is_empty() {
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"—".to_string()
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} else {
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// 加载器是站点给的小写 facet（`fabric`）：这一层只管怎么显示
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values
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.iter()
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.map(|value| capitalize(value))
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.collect::<Vec<_>>()
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.join(", ")
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};
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frame::text_role_owned(
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ui,
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TypeRole::BodySmall,
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false,
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catalog.render(key, &[("list", &list)]),
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ui.color(Role::OnSurfaceVariant),
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)
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}
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