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c49c778613
The Eye button required a fully resolved Attachment record (URL-lookup
via `resolveAttachment(href)`) before showing. Download only required
the URL, falling back to `openExternal(href)` when the lookup missed.
Result: any case where the URL in markdown couldn't be reverse-matched
to the entity's `attachments` prop (cross-comment copy-paste, stale
caches) silently hid the Preview button while Download kept working —
edit and readonly surfaces diverged for the same content.
Widen the Preview gate to mirror Download: show the Eye whenever the
filename indicates a previewable type. Introduce a `PreviewSource`
tagged union — `{ kind: "full", attachment }` for the existing path,
`{ kind: "url", url, filename }` for the fallback. Media kinds
(pdf/video/audio) render directly from the URL; text kinds still
require an attachment id because the /content proxy is ID-keyed, so
`tryOpen` rejects URL+text combinations and PreviewContent has a
defensive fallback for direct mounts.
Side effects:
- `getPreviewKind` gains filename-extension fallbacks for video/audio
(was PDF-only); without these the URL-only path can't infer kind
when content_type is empty.
- AttachmentList in comment-card.tsx unchanged behaviorally — only the
tryOpen call site is updated to the new signature.
Pre-existing architectural issues (AttachmentList readonly-only,
URL-based attachment lookup, per-entity ownership) are intentionally
out of scope.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>