fix(ui): preserve messages in non-chat windows while scrolled

_win_printf used to drop the buffer append and pad render for any window
in paged state, but only WIN_CHAT can recover lost messages via
chatwin_db_history on scroll-down. WIN_MUC, WIN_PRIVATE and WIN_AI have
no such fallback, so incoming and outgoing messages were silently lost
when the user was viewing history. Suppress the buffer/render only for
WIN_CHAT; for the rest, still bump unread_msg but let the message land
in the buffer so it becomes visible on scroll-down.

This also removes the manual paged/unread_msg reset before printing the
user message in cl_ev_send_ai_msg — it was a local workaround for the
same drop and is no longer needed.

The buffer-bottom reset in win_page_down (c167f487) is still required:
it is the only path that clears paged and unread_msg for non-chat
windows when the user scrolls back to the bottom (WIN_SCROLL_REACHED_BOTTOM
is set only on the is_chat DB branch).

src/event/client_events.c

@@ -301,12 +301,6 @@ cl_ev_send_ai_msg(ProfAiWin* aiwin, const char* const message, const char* const
         return;
     }
 
-    /* Reset paged flag before printing user message.
-     * If the user scrolled up to view history, paged=1 would suppress
-     * the message in _win_printf(). Reset it here so the message displays. */
-    aiwin->window.layout->paged = 0;
-    aiwin->window.layout->unread_msg = 0;
-
     // Display user message in AI window.
     win_print_outgoing(&aiwin->window, ">>", id, NULL, message);
 

src/ui/window.c

@@ -1809,10 +1809,15 @@ static void
 _win_printf(ProfWin* window, const char* show_char, int pad_indent, GDateTime* timestamp, int flags, theme_item_t theme_item, const char* const display_from, const char* const from_jid, const char* const message_id, const char* const message, ...)
 {
 
-    /* Prevent printing and buffer update when user is viewing message history [SCROLLING]*/
+    /* While the user is scrolled, bump the unread indicator. Only WIN_CHAT
+     * skips the buffer/render entirely — it can recover the message via
+     * chatwin_db_history on scroll-down. Other window types have no DB
+     * fallback, so the message must still be appended to the buffer and pad. */
     if (window->layout->paged && wins_is_current(window)) {
         window->layout->unread_msg++;
-        return;
+        if (window->type == WIN_CHAT) {
+            return;
+        }
     }
 
     if (timestamp == NULL) {