Resolve clippy warnings introduced this round

- AppearanceSettings derives Default instead of carrying a manual impl
  that's identical to the derived one.
- topbar::render_lock_or_search collapses the duplicated Search arms
  into a single fallback so clippy stops flagging identical blocks.
- command_overlay row helpers bundle id/title/hint/keys into a small
  CommandRowContent struct so render_row, render_row_with_glyph, and
  render_row_inner stay under the 7-arg threshold without losing any
  call-site clarity.

crates/ely_app/src/shell/chrome/topbar.rs

@@ -166,12 +166,10 @@ fn render_styled_url(active_tab: &BrowserTab) -> AnyElement {
 }
 
 fn render_lock_or_search(secure: bool, show_styled: bool) -> AnyElement {
-    let icon = if !show_styled {
-        IconName::Search
-    } else if secure {
-        IconName::Search
-    } else {
+    let icon = if show_styled && !secure {
         IconName::Globe
+    } else {
+        IconName::Search
     };
     div()
         .text_color(rgb(colors::INK_3))