right-align welcome status line, theme label opens picker

Status line aligned to the right. Theme name is clickable —
highlights on hover and executes theme.pick command to open
the theme picker dialog.

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

lib/builtin/welcome/src/welcome_view.dart

@@ -278,6 +278,7 @@ class _StatusLine extends StatelessWidget {
       builder: (ctx, _) {
         final tc = kernel.toolCheck;
         return Row(
+          mainAxisAlignment: MainAxisAlignment.end,
           children: [
             ClideText('clide 2.0.0-dev', muted: true, fontSize: 12, fontFamily: clideMonoFamily),
             ClideText('  ·  ', muted: true, fontSize: 12),
@@ -288,8 +289,7 @@ class _StatusLine extends StatelessWidget {
             else
               ClideText(tc.errors.join(' · '), fontSize: 12, fontFamily: clideMonoFamily, color: tokens.statusWarning),
             ClideText('  ·  ', muted: true, fontSize: 12),
-            ClideText('theme: ', muted: true, fontSize: 12, fontFamily: clideMonoFamily),
-            ClideText(themeName, fontSize: 12, fontFamily: clideMonoFamily, color: tokens.globalFocus),
+            _ThemeLink(tokens: tokens, kernel: kernel, themeName: themeName),
           ],
         );
       },
@@ -297,6 +297,39 @@ class _StatusLine extends StatelessWidget {
   }
 }
 
+class _ThemeLink extends StatefulWidget {
+  const _ThemeLink({required this.tokens, required this.kernel, required this.themeName});
+  final SurfaceTokens tokens;
+  final KernelServices kernel;
+  final String themeName;
+
+  @override
+  State<_ThemeLink> createState() => _ThemeLinkState();
+}
+
+class _ThemeLinkState extends State<_ThemeLink> {
+  bool _hover = false;
+
+  @override
+  Widget build(BuildContext context) {
+    return MouseRegion(
+      cursor: SystemMouseCursors.click,
+      onEnter: (_) => setState(() => _hover = true),
+      onExit: (_) => setState(() => _hover = false),
+      child: GestureDetector(
+        onTap: () => widget.kernel.commands.execute('theme.pick'),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            ClideText('theme: ', muted: true, fontSize: 12, fontFamily: clideMonoFamily),
+            ClideText(widget.themeName, fontSize: 12, fontFamily: clideMonoFamily, color: _hover ? widget.tokens.globalForeground : widget.tokens.globalFocus),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
 class _OpenProjectDialog extends StatefulWidget {
   const _OpenProjectDialog({required this.onOpen, required this.onCancel});
   final Future<void> Function(String path) onOpen;