Open search popup in navigation mode when results exist

F9 was always activating filter input, so arrow keys routed to the
command panel cursor instead of navigating the results table. Now when
results already exist, F9 opens the popup with input deactivated so
Up/Down immediately navigate results. Press / to edit the filter.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: trepidity

crates/loom-tui/src/app.rs

@@ -1832,7 +1832,10 @@ impl App {
             Action::SearchFocusInput => {
                 self.dismiss_all_popups();
                 self.search_dialog.visible = true;
-                if self.command_panel.input_buffer.is_empty() {
+                if self.search_dialog.has_results() {
+                    // Results exist — open in navigation mode (press / to edit filter)
+                    self.command_panel.soft_deactivate();
+                } else if self.command_panel.input_buffer.is_empty() {
                     self.command_panel.activate_input();
                 } else {
                     self.command_panel.resume_input();