fix(studio): promote guided-setup button + remove dead ModulesPage

The guided setup is the fastest path to a working first run, so lead
with a FilledButton instead of a low-emphasis outlined one (welcome
page). Delete pages/modules.dart — ModulesPage was never routed
(superseded by the Store 'Installed' filter) and nothing imports it;
flutter analyze stays clean.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/pages/welcome.dart

@@ -63,7 +63,10 @@ class WelcomePage extends StatelessWidget {
                   const SizedBox(height: ChainSpace.md),
                   Align(
                     alignment: Alignment.centerLeft,
-                    child: OutlinedButton.icon(
+                    // High-emphasis: the guided setup is the fastest path
+                    // to a working first run, so lead with a filled button
+                    // rather than a low-key outlined one.
+                    child: FilledButton.icon(
                       onPressed: () => GuidedSetupDialog.show(context),
                       icon: const Icon(Icons.auto_fix_high),
                       label: Text(AppLocalizations.of(context)!.guidedSetupTitle),