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COD-38 document attachment previews + thumbnails (attachment cards)

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Builds on the COD-37 registry: surfaces detected/registered attachments as
dismissible cards with a first-page thumbnail and an inline preview — the
consumer the registry PR deliberately deferred.

Backend:
- document-thumbnailer: first-page PNG thumbnails (PNG passthrough; PDF via
  pdftoppm; Office via the preview cache).
- document-preview-cache: disk-cached DOCX/PPTX -> PDF conversion (LibreOffice
  / PowerShell COM), in-flight dedup, multi-converter fallback.
- file-routes: serveConvertedPreview / serveThumbnail + four routes —
  GET .../attachments/:id/preview, .../thumbnail and the workspace-path
  file-preview / file-thumbnail. Reuses the registry's TOCTOU-safe
  resolveServableAttachmentPath, so previews stream the freshly-resolved path.
- server: enrich detected attachment events with a thumbnail route.
- image-watcher: .png now routes to attachment:detected — this PR adds the card
  consumer, so the screenshot popup is no longer its only handler.

Frontend:
- panels-ui: attachment cards (addAttachmentCard, lazy stack, Clear-all,
  per-session cleanup) plus a 3-arg openFilePreview that renders registered
  attachments inline (image/PDF) or via the server-converted PDF (docx/pptx).
- app.js: wire attachment:detected -> _onAttachmentDetected and card state.
- styles: attachment-card + stack styling.

Verified: tsc / eslint / prettier / frontend-syntax clean; new thumbnailer +
preview-cache unit tests pass; full test:ci green (2861 passed); card render +
preview overlay + dismiss verified in-browser.
This commit is contained in:
Aamer Akhter
2026-06-12 09:09:14 -04:00
parent 3f2c23cb0f
commit 49c92e4723
11 changed files with 1116 additions and 17 deletions
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src/image-watcher.ts
+2 -6
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@@ -20,12 +20,8 @@ import { KeyedDebouncer } from './utils/index.js';
// ========== Constants ==========
/** Supported image file extensions (lowercase) */
// PNG stays on the image-popup path: it's the dominant screenshot format and the
// frontend only wires the `image:detected` popup today. The attachment-card UI
// that would consume `attachment:detected` for images is out of scope for this
// PR, so routing PNG to it would silently break the dropped-screenshot popup.
const IMAGE_POPUP_EXTENSIONS = new Set(['.png', '.jpg', '.jpeg', '.gif', '.webp', '.bmp', '.svg']);
const ATTACHMENT_EXTENSIONS = new Set(['.pdf', '.docx', '.pptx']);
const IMAGE_POPUP_EXTENSIONS = new Set(['.jpg', '.jpeg', '.gif', '.webp', '.bmp', '.svg']);
const ATTACHMENT_EXTENSIONS = new Set(['.png', '.pdf', '.docx', '.pptx']);
const DETECTED_FILE_EXTENSIONS = new Set([...IMAGE_POPUP_EXTENSIONS, ...ATTACHMENT_EXTENSIONS]);
/** Time to wait for file writes to stabilize (ms) */