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Aamer Akhter
49c92e4723
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.
