Fix dead-pane regression: drop the absolute highlight overlay

Round 12 painted the inner highlight ring through an absolutely
positioned overlay that covered every glass panel. User reports the
right pane was unclickable, the search bar wouldn't take input, and
sidebar tab close buttons never appeared on hover. Even though the
overlay div had no listeners, in this layout it was racing the
parent's hit-test for the same pixels — the close glyph in
`render_launcher_row` is `opacity(0)` until `group_hover` fires, and
the overlay was preventing that hover from registering.

Move the highlight onto each panel's own `.border_1()` so the ring is
part of the panel paint, not a separate overlay. Painted, never
hit-tested. The four wired callers (expanded sidebar, compact
sidebar, main pane, command overlay panel) now each carry their
inner border directly. `chrome::glass` deletes; nothing else used it.

The 1 px brighter top-edge specular sliver from the design is gone —
GPUI 0.2.2 has no asymmetric border colors and live clicks beat that
single-pixel polish.

cargo test --workspace: 440 passed, 0 failed.

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

@@ -15,7 +15,6 @@ use crate::shell::chrome::command_match::{
 use crate::shell::chrome::command_rows::{
     render_action_rows, render_bookmark_rows, render_history_rows, render_tab_rows,
 };
-use crate::shell::chrome::glass::render_inner_highlight;
 
 const COMMAND_PREFIX: &str = ">";
 
@@ -72,15 +71,15 @@ fn render_panel(
         .w(px(640.0))
         .rounded(px(16.0))
         .bg(rgba(PANEL_BG))
+        .border_1()
+        .border_color(rgba(PANEL_BORDER))
         .shadow(panel_shadow())
         .overflow_hidden()
-        .relative()
         .flex()
         .flex_col()
         .child(render_header(query_label.clone(), needle.is_empty()))
         .child(render_results(snapshot, needle, selected_index, cx))
         .child(render_command_footer())
-        .child(render_inner_highlight(16.0))
         .into_any_element()
 }
 
@@ -219,6 +218,7 @@ fn render_empty_state() -> AnyElement {
 }
 
 const PANEL_BG: u32 = 0xfffffff5;
+const PANEL_BORDER: u32 = 0xffffff80;
 const BACKDROP_BG: u32 = 0x140f0a3d;
 const BADGE_BG: u32 = 0x281e140f;