Share links now use .pdf extension and Content-Disposition header for Android compatibility

main.go

@@ -576,7 +576,7 @@ func createShareHandler(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(map[string]string{
 		"token": token,
-		"url":   "/s/" + token,
+		"url":   "/s/" + token + ".pdf",
 	})
 }
 
@@ -602,6 +602,7 @@ func listSharesHandler(w http.ResponseWriter, r *http.Request) {
 
 func publicShareHandler(w http.ResponseWriter, r *http.Request) {
 	token := chi.URLParam(r, "token")
+	token = strings.TrimSuffix(token, ".pdf")
 	doc, err := GetShare(token)
 	if err != nil || doc == nil {
 		http.Error(w, "Not found", http.StatusNotFound)
@@ -617,6 +618,12 @@ func publicShareHandler(w http.ResponseWriter, r *http.Request) {
 			} else {
 				w.Header().Set("Content-Type", "text/plain")
 			}
+			// Set filename so Android/browsers handle it properly
+			filename := strings.ReplaceAll(doc.Title, " ", "-") + ext
+			if ext == "" {
+				filename += ".pdf"
+			}
+			w.Header().Set("Content-Disposition", fmt.Sprintf(`inline; filename="%s"`, filename))
 			http.ServeFile(w, r, path)
 			return
 		}