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* feat(storage): add GetReader to Storage interface Adds a streaming read method to the Storage abstraction so callers can pull object bytes without forcing a full in-memory load. S3Storage wraps GetObject; LocalStorage opens the file with path-traversal and sidecar guards. Tests cover happy path, traversal rejection, sidecar rejection, and missing key. Used in the next commit by the attachment-preview proxy endpoint. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(server): add attachment preview proxy endpoint GET /api/attachments/{id}/content streams the raw bytes of a text-previewable attachment back to the client. Exists to (a) bypass CloudFront CORS, which is not configured on the CDN, and (b) bypass Content-Disposition: attachment which Chromium honors for iframe document loads. Media types (image/video/audio/pdf) intentionally do NOT go through this endpoint — clients render them directly from the signed CloudFront download_url, which is already served with Content-Disposition: inline. Hard cap: 2 MB. Larger files return 413. Anything outside the text whitelist returns 415. The whitelist (isTextPreviewable) mirrors the client-side dispatcher; the cross-reference comment in file.go flags the manual sync until a JSON SSOT generator lands. Response always uses Content-Type: text/plain; charset=utf-8 so a hostile HTML payload can't be re-interpreted as a document. The original MIME ships via X-Original-Content-Type for client dispatch. Cache-Control: no-store so revoked attachment access takes effect immediately on the next request. Tests cover happy path (md), extension fallback when content_type is generic, 415 (pdf), 413 (>2MB), foreign workspace (404 isolation), and the isTextPreviewable table. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(core/api): add getAttachmentTextContent + preview error types Adds an ApiClient method that fetches the text body of an attachment via the new /api/attachments/{id}/content proxy. Two typed errors — PreviewTooLargeError (413) and PreviewUnsupportedError (415) — let the preview modal render specific fallbacks instead of a generic failure. Refactors the private fetch() into a shared fetchRaw() helper so the new method inherits the standard infra: auth headers, 401 → handleUnauthorized recovery, X-Request-ID, error logging, and the ApiError contract. The previous draft bypassed all of these by calling window.fetch directly. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(views/editor): add AttachmentPreviewModal + Eye entry points In-app preview for non-image attachments. An Eye icon now sits next to the existing Download button on file cards / readonly file cards / the standalone AttachmentList. Clicking it opens a full-screen modal that dispatches by content_type: pdf: <iframe src={download_url}> — Chromium PDFium video/*: <video controls src={download_url}> — native controls audio/*: <audio controls src={download_url}> — native controls md: <ReadonlyContent> — full markdown pipeline html: <iframe srcdoc sandbox=""> — fully restricted text: <code class="hljs"> — lowlight highlight Media types render directly from the signed CloudFront download_url (server marks them inline-disposition). Text types fetch through the new /api/attachments/{id}/content proxy via TanStack Query, wrapped in useAttachmentPreview() so each entry point owns its own modal state without depending on a global Provider mount. Modal sizing: max-w-6xl × min(90vh, 100vh - 2rem) — slightly larger than create-issue's max-w-4xl since PDF / video need room, but capped to viewport on small screens. Sub-renderers use h-full to follow the fixed modal height instead of viewport-relative units. Images are intentionally NOT touched — the existing ImageLightbox (extensions/image-view.tsx) already handles them correctly. The new modal would be churn without user-visible benefit. Adds i18n keys under attachment.* (en + zh-Hans) and registers Preview/Download/Upload in the conventions glossary so future translations stay consistent. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * chore(desktop): enable Chromium PDF viewer for attachment preview Adds webPreferences.plugins: true to the main BrowserWindow so the bundled Chromium PDFium plugin activates inside iframes — required for the attachment preview modal's PDF dispatch. Default is false in Electron; without it <iframe src=*.pdf> renders blank. Security trade-off, accepted intentionally and documented inline: 1. This window already runs with webSecurity: false + sandbox: false, so plugins: true does NOT meaningfully widen the renderer's attack surface beyond what is already accepted. 2. The only PDFs that reach an iframe here are signed CloudFront URLs we ourselves issued; user-supplied URLs are routed through setWindowOpenHandler → openExternalSafely and cannot land in this renderer. 3. Chromium's PDFium plugin is itself sandboxed and only handles application/pdf — no Flash/Java/other historical plugin surfaces. If we ever tighten webSecurity / sandbox, the follow-up is to host the PDF viewer in a dedicated BrowserView with plugins scoped to that view, keeping the main renderer plugin-free. Old desktop builds ship without the preview modal, so the Eye button never appears and PDF preview is gated by the same release — zero regression risk for users on stale clients. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>