fix hat bar visible in welcome mode, fix overflow

Hat bar moved above the Stack so it stays visible when the welcome
overlay shows. Recent project path row uses Flexible with ellipsis
to prevent horizontal overflow.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/app.dart

@@ -89,11 +89,18 @@ class _RootShellState extends State<_RootShell> {
             windowControls: widget.services.window,
             child: DialogHost(
               router: widget.services.dialog,
-              child: Stack(
+              child: Column(
                 children: [
-                  const Positioned.fill(child: RootLayout()),
-                  const ClidePalette(),
-                  const Positioned.fill(child: _WelcomeOverlay()),
+                  _HatBar(kernel: widget.services),
+                  Expanded(
+                    child: Stack(
+                      children: [
+                        const Positioned.fill(child: RootLayout()),
+                        const ClidePalette(),
+                        const Positioned.fill(child: _WelcomeOverlay()),
+                      ],
+                    ),
+                  ),
                 ],
               ),
             ),
@@ -136,7 +143,6 @@ class RootLayout extends StatelessWidget {
 
         return Column(
           children: [
-            _HatBar(kernel: kernel),
             Expanded(
               child: Row(
                 children: [

lib/builtin/welcome/src/welcome_view.dart

@@ -244,7 +244,7 @@ class _RecentRowState extends State<_RecentRow> {
                     const SizedBox(height: 3),
                     Row(
                       children: [
-                        ClideText(widget.project.relativePath, muted: true, fontSize: 13, fontFamily: clideMonoFamily),
+                        Flexible(child: ClideText(widget.project.relativePath, muted: true, fontSize: 13, fontFamily: clideMonoFamily, maxLines: 1, overflow: TextOverflow.ellipsis)),
                         if (widget.project.branch != null) ...[
                           ClideText('  ·  ', muted: true, fontSize: 13),
                           ClideIcon(PhosphorIcons.gitBranch, size: 11, color: widget.tokens.globalTextMuted),