fix: position host cursor for CJK IME even when app hides cursor (#4951)

* fix: position host cursor for CJK IME even when app hides cursor

When apps like Claude Code (ink/React library) hide the cursor during
rendering, Zellij's render_cursor() was not sending a CUP sequence to
the host terminal. This caused IME composition candidates to appear at
the wrong position, breaking CJK input in these apps.

Change cursor_coordinates() to return the cursor position unconditionally
(as long as it is within bounds) along with a bool indicating visibility.
render_cursor() now positions the host cursor even when the app has hidden
it, so the IME subsystem can read the correct cursor position.

* add test

* rustfmt

---------

Co-authored-by: Aram Drevekenin <aram@poor.dev>

1 files changed, 2 insertions, 2 deletions

diff --git a/zellij-server/src/panes/plugin_pane.rs b/zellij-server/src/panes/plugin_pane.rs
index aeed38c7..10e7186c 100644
--- a/zellij-server/src/panes/plugin_pane.rs
+++ b/zellij-server/src/panes/plugin_pane.rs
@@ -252,7 +252,7 @@ impl Pane for PluginPane {
 
         self.should_render.insert(client_id, true);
     }
-    fn cursor_coordinates(&self, client_id: Option<ClientId>) -> Option<(usize, usize)> {
+    fn cursor_coordinates(&self, client_id: Option<ClientId>) -> Option<(usize, usize, bool)> {
         let own_content_columns = self.get_content_columns();
         let own_content_rows = self.get_content_rows();
         let Offset { top, left, .. } = self.content_offset;
@@ -265,7 +265,7 @@ impl Pane for PluginPane {
                     if x >= own_content_columns || y >= own_content_rows {
                         None
                     } else {
-                        Some((x, y)) // these are 0 indexed
+                        Some((x, y, true)) // plugins always show cursor when position is set
                     }
                 })
         } else {