fix(core): render the correct output in the tui terminal pane when pinning task (#31975)

## Current Behavior

In the TUI, opening the Terminal Pane for a task with the space bar,
navigating to another task, and pressing "1" to pin it, results in the
terminal pane displaying the output of the task for which the space bar
was pressed initially instead of the pinned task.

## Expected Behavior

Pinning tasks in the TUI should work correctly and always display the
output of the pinned task.

(cherry picked from commit dd57e0f)

Author: leosvelperez

packages/nx/src/native/tui/app.rs

@@ -1158,9 +1158,23 @@ impl App {
             .collect()
     }
 
+    /// Clears PTY reference and related state for a specific pane
+    fn clear_pane_pty_reference(&mut self, pane_idx: usize) {
+        if pane_idx < 2 {
+            self.terminal_pane_data[pane_idx].pty = None;
+            self.terminal_pane_data[pane_idx].can_be_interactive = false;
+            self.terminal_pane_data[pane_idx].set_interactive(false);
+        }
+    }
+
     /// Clears all output panes and resets their associated state.
     fn clear_all_panes(&mut self) {
         self.pane_tasks = [None, None];
+
+        // Clear PTY references for both panes
+        self.clear_pane_pty_reference(0);
+        self.clear_pane_pty_reference(1);
+
         self.update_focus(Focus::TaskList);
         self.set_spacebar_mode(false, None);
         self.dispatch_action(Action::UnpinAllTasks);
@@ -1368,6 +1382,12 @@ impl App {
 
         // If we're in spacebar mode and this is pane 0, convert to pinned mode
         if self.spacebar_mode && pane_idx == 0 {
+            // Clear the PTY reference when converting from spacebar to pinned mode
+            self.clear_pane_pty_reference(pane_idx);
+
+            // Pin the currently selected task to the pane
+            self.pane_tasks[pane_idx] = Some(task_name.clone());
+
             // When converting from spacebar to pinned, stay in name-tracking mode
             self.set_spacebar_mode(false, Some(SelectionMode::TrackByName));
             if self.layout_manager.get_pane_arrangement() == PaneArrangement::None {
@@ -1381,6 +1401,9 @@ impl App {
                 // Unpin the task if it's already pinned
                 self.pane_tasks[pane_idx] = None;
 
+                // Clear the PTY reference when unpinning
+                self.clear_pane_pty_reference(pane_idx);
+
                 // If this was previously pane 2 and its now unpinned and pane 1 is still set, set the pane arrangement to single
                 if pane_idx == 1 && self.pane_tasks[0].is_some() {
                     self.layout_manager
@@ -1724,6 +1747,10 @@ impl App {
             if let Some(pty) = self.pty_instances.get(&task_name) {
                 terminal_pane_data.can_be_interactive = in_progress && pty.can_be_interactive();
                 terminal_pane_data.pty = Some(pty.clone());
+            } else {
+                // Clear PTY data if the task exists but doesn't have a PTY instance
+                terminal_pane_data.pty = None;
+                terminal_pane_data.can_be_interactive = false;
             }
         } else {
             // Clear PTY data when switching to a task that doesn't have a PTY instance