fix(panel): start Info and Changes flush under the tab row

Their first line is text centred in a 28px row, so the extra 8px step put
it visibly lower than the Files tab's search well. Only Files keeps it.

src/ui/right_panel.rs

@@ -589,7 +589,16 @@ impl Tty7App {
                         cx,
                     ))
                 }))
-                .children(cfg!(target_os = "macos").then(|| div().flex_none().h(px(8.))))
+                // Only the Files tab steps down 8px. Its first row is a filled
+                // search well whose top edge is the first thing you see, so it
+                // wants air under the tab row. Info and Source Control open on
+                // bare text centred in a 28px row, which already sits ~7px
+                // under the row's top; adding 8 more put their first line a
+                // visible step lower than the Files well beside them.
+                .children(
+                    (cfg!(target_os = "macos") && tab == RightPanelTab::Files)
+                        .then(|| div().flex_none().h(px(8.))),
+                )
                 .child(body)
                 .children(self.sftp_transfers_footer(cx))
                 .child(handle)

src/ui/scm/panel.rs

@@ -118,10 +118,11 @@ const COMMIT_RADIUS: gpui::Pixels = px(6.);
 /// one unit: 8px under the tab row, 10px between its three parts and 14px
 /// before the first group.
 ///
-/// On macOS the panel already puts 8px between its tab row and every tab's
-/// body (`render_right_panel`), so the block adds nothing of its own there;
-/// adding it anyway put the branch 16px down while Info and Files started at
-/// 8. Elsewhere the tab row is inside the body and the 8 is this block's.
+/// On macOS the block starts flush under the tab row, the way Info does: the
+/// branch is text centred in a 28px row, so it already sits ~7px down, level
+/// with the top edge of the Files tab's search well (which does get an 8px
+/// step, see `render_right_panel`). Elsewhere the tab row is inside the body
+/// and the 8 is this block's.
 const PINNED_TOP: f32 = if cfg!(target_os = "macos") { 0. } else { 8. };
 const PINNED_GAP: f32 = 10.;
 const PINNED_BOTTOM: f32 = 14.;