#221: image paste view fixes

- image pastes scale to fit the viewer box (max-width/max-height, object-fit)
- no text/code box rendered below the image for image pastes
- link pill positioning cleaned up on the image view
- /raw for attachment pastes redirects to the file itself
- view details size now uses the attachment blob size, not empty text len

internal/web/web.go

@@ -245,28 +245,36 @@ func (h *Handlers) renderPaste(w http.ResponseWriter, row *store.PasteRow, justC
 	if lang == "" {
 		lang = "text"
 	}
-	summary := fmt.Sprintf("%s · %s · %d views · %s", lang, humanSize(len(row.Content)), row.ViewCount, agoString(row.CreatedAt))
 	// #38: one optional file attachment per paste; nil when none.
 	attachment, err := h.Store.GetAttachmentForPaste(row.ID)
 	if err != nil {
 		http.Error(w, "db error", 500)
 		return
 	}
+	// #221: for attachment pastes the stored text content is empty (the file
+	// replaced it), so size must come from the attachment blob, not
+	// len(row.Content), or the view details show a wrong size.
+	sizeBytes := len(row.Content)
+	if attachment != nil {
+		sizeBytes = int(attachment.Size)
+	}
+	summary := fmt.Sprintf("%s · %s · %d views · %s", lang, humanSize(sizeBytes), row.ViewCount, agoString(row.CreatedAt))
 	data := map[string]any{
 		"Page":          "paste",
 		"ID":            row.ID,
 		"Title":         row.Title.String,
 		"Language":      row.Language.String,
 		"StatsSummary":  summary,
-		"SizeHuman":     humanSize(len(row.Content)),
+		"SizeHuman":     humanSize(sizeBytes),
 		"HasPassword":   row.PasswordHash.Valid,
 		"BurnAfterRead": row.BurnAfterRead,
 		"CustomSlug":    row.CustomSlug.String,
+		"IsImagePaste":  attachment != nil && strings.HasPrefix(attachment.Mime, "image/"),
 		"ContentHTML":   template.HTML(langpkg.HighlightCode(row.Content, row.Language.String)), // safe: HighlightCode escapes all non-span text
 		"ContentAttr":   row.Content,
 		"Gutter":        strings.TrimSuffix(gutter, "\n"),
 		"LineCount":     lines,
-		"SizeBytes":     len(row.Content),
+		"SizeBytes":     sizeBytes,
 		"CreatedAgo":    agoString(row.CreatedAt),
 		"CreatedAtUnix": row.CreatedAt,
 		"ViewCount":     row.ViewCount,