my_sea_visit: share the owner picker styling (--duoUser felt + fill) when showing the draw — TDD

The bud-sea (visitor) VIEW DRAW rendered the cross but kept data-phase=landing,
so it sat on the --priUser landing bg instead of the owner's --duoUser picker
felt, and its #id_my_sea_visit_draw wrapper wasn't a flex container so the
picker didn't fill/centre like the owner's.

DRY fix (no new visit-only styling):
- VIEW DRAW toggle now flips .my-sea-page data-phase landing<->picker, so the
  cross reuses the shared .my-sea-page[data-phase=picker] --duoUser felt rule.
- .my-sea-visit-draw is display:contents, so its .my-sea-picker child becomes a
  direct flex item of .my-sea-page and fills/centres via the existing
  .my-sea-picker sizing.

FT asserts the page flips to data-phase=picker on VIEW DRAW.

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/templates/apps/gameboard/my_sea_visit.html

@@ -135,7 +135,11 @@
     {% endif %}
     <script>
     (function () {
-        // VIEW DRAW toggles the read-only draw against the table hex.
+        // VIEW DRAW toggles the read-only draw against the table hex. The
+        // page's data-phase flips landing↔picker so the cross reuses the
+        // owner's `.my-sea-page[data-phase="picker"]` --duoUser felt bg (DRY —
+        // same rule the owner picker rides). The hex view stays "landing".
+        var page = document.querySelector('.my-sea-page');
         var viewBtn = document.getElementById('id_my_sea_view_draw_btn');
         var draw = document.getElementById('id_my_sea_visit_draw');
         var landing = document.querySelector('.my-sea-visit-landing');
@@ -144,6 +148,7 @@
                 var showing = draw.style.display !== 'none';
                 draw.style.display = showing ? 'none' : '';
                 if (landing) landing.style.display = showing ? '' : 'none';
+                if (page) page.setAttribute('data-phase', showing ? 'landing' : 'picker');
             });
         }
         // GATE VIEW → visitor gate.