feat: add evidence search and stabilize pdf previews
- add document evidence parsing/search/open routes, Hermes tool wiring, local index settings/status, and the document-evidence skill plus design notes - fix PDF resource tabs by rendering PDFs inline with pdf.js canvases instead of iframe preview pages, release PDF documents on close, and document the fourth-PDF stall bug - keep PDF preview at 2x rendering while removing the previous lazy-load/placeholder direction, and make dev:hot bind loopback defaults externally reachable Verification: - node --check rust/crates/mnote-web/browser/document-resource-tab-runtime.js - node scripts/task-dev-hot-plan-test.js - cargo test -p mnote-web --manifest-path rust/Cargo.toml pdf_preview_page_does_not_render_visible_toolbar - cargo test -p mnote-web --manifest-path rust/Cargo.toml document_shell_returns_page_aggregate_snapshot - cargo build -p mnote-web --manifest-path rust/Cargo.toml - browser smoke: sequentially opened the four tea_seed_oil_cosmetic PDFs; fourth PDF rendered 15/15 canvases, iframeCount=0, browser errors=0
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# PDF resource tab 连续打开第 4 个文件卡住
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## 现象
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- 在文档页 resource tab 内连续打开多个 PDF 时,第 4 个 PDF 必现卡住。
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- 卡住时 tab 标题已经切换,但 iframe 仍停在 `about:blank` 或空 body,PDF canvas 数量为 0。
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- 单独打开 `/pdf-preview` 页面、或独立页面中复用单个 iframe 连续切换 PDF,均不能复现。
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## 根因
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PDF resource tab 通过 iframe 加载 `/pdf-preview`,连续创建/替换 PDF iframe 后会进入空白加载状态。问题不在具体 PDF 文件,也不在页数懒加载策略。
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## 修复
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- resource tab 内的 PDF 改为直接使用 pdf.js 渲染 canvas,不再通过 iframe 打开 `/pdf-preview`。
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- 关闭或替换 PDF resource tab 时销毁 pdf.js document,释放渲染资源。
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- 移除 `/pdf-preview` 内此前排查用的懒加载、占位页和多页预渲染逻辑,保留 2x 起步渲染清晰度。
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- `dev:hot` 默认把 loopback bind 修正为 `0.0.0.0:<port>`,避免外网访问不到 3000。
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## 验证
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- 真实浏览器连续打开以下 4 个 PDF:
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- `patent/WO2024170760A1_Camellia_oleifera_tea_oil_concentrate.pdf`
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- `standard/T_CAIFCCI_106-2026_cosmetic_ingredient_camellia_oleifera_seed_oil.pdf`
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- `literature/Ouyang_2024_Frontiers_aged_Camellia_oleifera_oil_AD.pdf`
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- `literature/Leclere_2025_OCL_Tea_oil_concentrate.pdf`
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- 第 4 个 PDF 结果:`canvasCount=15`,`iframeCount=0`,`status=15 / 15`,浏览器错误 0。
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- `node --check rust/crates/mnote-web/browser/document-resource-tab-runtime.js`
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- `node scripts/task-dev-hot-plan-test.js`
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- `cargo test -p mnote-web --manifest-path rust/Cargo.toml pdf_preview_page_does_not_render_visible_toolbar`
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- `cargo test -p mnote-web --manifest-path rust/Cargo.toml document_shell_returns_page_aggregate_snapshot`
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- `cargo build -p mnote-web --manifest-path rust/Cargo.toml`
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