Fix focus handling in ProjectSearchBar. (#61093)

# Objective

Fix #61023

When project search is already open and focused, pressing the project
search shortcut again (`cmd-shift-f` / `ctrl-shift-f`) only re-focused
the query editor and did not select the existing query text. That made
it hard to quickly retype a search term—especially after a no-results
search, when focus stays in the search bar.

This aligns project search behavior with buffer search, where
`FocusSearch` focuses and selects the query.

## Solution

In `ProjectSearchBar::focus_search`, call `focus_query_editor` instead
of only focusing the query editor. `focus_query_editor` already focuses
the field and selects all text (same path used by `DeploySearch`).

## Testing

- [ ] Manual: open project search → type a non-matching query → Enter →
press project search shortcut again → query text should be selected so
typing replaces it
- [ ] Manual: same flow after a search that returns matches
- [ ] Manual: compare with buffer search (`cmd-f` / `ctrl-f`) to confirm
consistent “refocus selects query” behavior
- Platforms: tested / to be tested on macOS; Linux/Windows should behave
the same via the shared `FocusSearch` action

No automated test added yet; a `gpui::test` that deploys project search,
dispatches `FocusSearch`, and asserts the query editor selection would
be a good follow-up.

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

---

Release Notes:

- N/A

crates/search/src/project_search.rs

@@ -1981,7 +1981,7 @@ impl ProjectSearchBar {
     fn focus_search(&mut self, window: &mut Window, cx: &mut Context<Self>) {
         if let Some(search_view) = self.active_project_search.as_ref() {
             search_view.update(cx, |search_view, cx| {
-                search_view.query_editor.focus_handle(cx).focus(window, cx);
+                search_view.focus_query_editor(window, cx);
             });
         }
     }