Rework file picker for SSH modal (#19020)

This PR changes the SSH modal design so its more keyboard
navigation-friendly and adds the server nickname feature.

Release Notes:

- N/A

---------

Co-authored-by: Danilo <danilo@zed.dev>
Co-authored-by: Danilo Leal <67129314+danilo-leal@users.noreply.github.com>

crates/picker/src/picker.rs

@@ -476,7 +476,7 @@ impl<D: PickerDelegate> Picker<D> {
         }
     }
 
-    pub fn set_query(&self, query: impl Into<Arc<str>>, cx: &mut ViewContext<Self>) {
+    pub fn set_query(&self, query: impl Into<Arc<str>>, cx: &mut WindowContext<'_>) {
         if let Head::Editor(ref editor) = &self.head {
             editor.update(cx, |editor, cx| {
                 editor.set_text(query, cx);