fix: increase contrast between workspace chrome and content

docs/ui-workspace-audit.md

@@ -79,3 +79,13 @@ bundle and diff whitespace checks passed. No test suite or smoke script was run.
 All earlier requirements were reviewed against the table above; isolated Chrome
 motion comparison and the explicitly listed cross-window/DPI verification gaps
 remain unverified, rather than being marked complete.
+
+
+## Chrome contrast correction
+
+The continuous top/left chrome now uses #E6E9ED instead of #F5F5F5,
+separating it visibly from the #F7F7F5 content canvas. Selected tabs retain
+white fill and dark text; inactive titles use muted text. Geometry and borderless
+selection are unchanged. After rebuilding and restarting, the native window
+showed one startup tab; a + click added a second tab and the two states were
+visually checked. Formatting, all-target offline Clippy and release bundling passed.

src/system_ui/theme.rs

@@ -1,6 +1,7 @@
 use crate::display_list::Color;
 pub const BG: Color = Color::rgb(255, 255, 255);
-pub const BAR: Color = Color::rgb(245, 245, 245);
+// A visibly separate chrome layer against the warm, near-white content canvas.
+pub const BAR: Color = Color::rgb(230, 233, 237);
 pub const BORDER: Color = Color::rgb(226, 226, 226);
 pub const TEXT: Color = Color::rgb(35, 42, 53);
 pub const MUTED: Color = Color::rgb(103, 114, 130);

src/tabs.rs

@@ -374,7 +374,11 @@ pub fn draw(
             ),
             value: title.into(),
             style: TextStyle::ui(1).scaled(scale),
-            color: crate::system_ui::theme::TEXT,
+            color: if active {
+                crate::system_ui::theme::TEXT
+            } else {
+                crate::system_ui::theme::MUTED
+            },
         });
         list.push(DrawCommand::PopClip);
         if item.navigation.is_none() && item.rect.width >= 44.0 {