feat(m9): graphical first-run setup wizard — 0.26.0

The full installer experience as a GUI wizard (gui/setup_wizard.py): environment
summary → pick dependency bundles (from the catalog, grouped) → install missing
apt packages → choose recording trigger → readiness summary.

- Shown on first launch (config setup_done) and via `rigdoctor-gui --setup`;
  re-runnable from Settings → Run setup wizard.
- install.sh launches it after a fresh install when a desktop session is present.
- catalog.by_bundle() groups components; config gains setup_done.
- Tests: by_bundle grouping + wizard construction smoke.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_gui_smoke.py

@@ -64,6 +64,13 @@ class GuiSmokeTests(unittest.TestCase):
         self.assertIn("14.2 / 31.0 GB", tray._mem_act.text())
         self.assertEqual(tray._status_act.text(), "● Normal")
 
+    def test_setup_wizard_constructs(self):
+        from rigdoctor.gui.setup_wizard import SetupWizard
+
+        wizard = SetupWizard()
+        self.assertEqual(wizard._stack.count(), 5)  # welcome/bundles/install/trigger/finish
+        self.assertTrue(wizard._bundle_checks)
+
 
 if __name__ == "__main__":
     unittest.main()