fix bottom input box alignment when status bar hidden (T-298)

The composer (and any bottom-most pane content) ran flush into the
window's bottom resize-drag strip when the status bar was hidden, since
the bar normally covers that edge. Reserve ClideResizeBorder.edgeThickness
as a bottom inset in RootLayout whenever the status bar is not visible, so
the interaction zone bottom-anchors consistently either way.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/app.dart

@@ -234,7 +234,7 @@ class RootLayout extends StatelessWidget {
         final dockMax = (((MediaQuery.of(ctx).size.height) - statusHeight) * 0.5).clamp(80.0, double.infinity).toDouble();
         final dockHeight = dockVisible ? ((a.sizeOf(Slots.dock) ?? 200).clamp(0.0, dockMax)).toDouble() : 0.0;
 
-        return Column(
+        final column = Column(
           children: [
             Expanded(
               child: Row(
@@ -310,6 +310,17 @@ class RootLayout extends StatelessWidget {
               ),
           ],
         );
+        // When the status bar is hidden it no longer occupies the window's
+        // bottom edge, so the bottom-most content (the Claude composer, an
+        // editor, a terminal) would otherwise run flush into the resize-drag
+        // strip and look jammed against the window bottom (T-298). Reserve a
+        // matching inset so the interaction zone bottom-anchors consistently,
+        // independent of status-bar visibility.
+        if (statusVisible) return column;
+        return Padding(
+          padding: const EdgeInsets.only(bottom: ClideResizeBorder.edgeThickness),
+          child: column,
+        );
       },
     );
   }

lib/widgets/src/clide_resize_border.dart

@@ -7,7 +7,12 @@ class ClideResizeBorder extends StatelessWidget {
   final WindowControls windowControls;
   final Widget child;
 
-  static const double _edge = 6;
+  /// Thickness of the window-edge resize-drag strips. Exposed so layouts can
+  /// reserve a matching inset for bottom-most content that would otherwise sit
+  /// under the bottom drag zone when no chrome (e.g. the status bar) covers it
+  /// (T-298).
+  static const double edgeThickness = 6;
+  static const double _edge = edgeThickness;
   static const double _corner = 12;
 
   @override