notes(shared): show Send button on notes inside shared folders

User report (AR, RH on iPad): no Send button visible inside a shared
"desk" folder. The shared-folder view was passing `hideSend` to every
NoteCard for editors and rendered no card actions at all for
read-only viewers, so nobody could send a note from a shared folder.

Changes (artifacts/tx-os/src/pages/notes.tsx, SharedFolderView):
- Editors: removed `hideSend` from the NoteCard so the existing Send
  affordance (and color/labels/archive/delete) appears as it does on
  the user's own notes.
- Read-only viewers: added a small Send icon button to the static
  card (testid `shared-folder-note-send-<id>`) so they can also send
  the note via the existing send dialog.

The send endpoint authorizes off the authenticated caller, so the
note is sent under RH's identity (no server change needed).

artifacts/tx-os/src/pages/notes.tsx

@@ -3500,7 +3500,6 @@ function SharedFolderView({
                 labels={labels}
                 onEdit={onEdit}
                 onSend={onSend}
-                hideSend
               />
             ))}
           </div>
@@ -3515,12 +3514,12 @@ function SharedFolderView({
             <div
               key={n.id}
               data-testid={`shared-folder-note-${n.id}`}
-              className={`text-start break-inside-avoid mb-3 w-full rounded-xl border border-black/5 shadow-sm p-3 ${colorBg(
+              className={`relative text-start break-inside-avoid mb-3 w-full rounded-xl border border-black/5 shadow-sm p-3 ${colorBg(
                 n.color,
               )}`}
             >
               {n.title && (
-                <div className="font-semibold text-sm text-foreground break-words">
+                <div className="font-semibold text-sm text-foreground break-words pe-8">
                   {n.title}
                 </div>
               )}
@@ -3538,6 +3537,18 @@ function SharedFolderView({
                   </div>
                 )
               )}
+              <button
+                type="button"
+                onClick={(e) => {
+                  e.stopPropagation();
+                  onSend(n);
+                }}
+                className="absolute top-2 end-2 p-1.5 rounded-md bg-white/70 hover:bg-white text-muted-foreground hover:text-primary transition-colors"
+                aria-label={t("notes.send", "Send")}
+                data-testid={`shared-folder-note-send-${n.id}`}
+              >
+                <Send size={15} />
+              </button>
             </div>
           ))}
         </div>