my-sea slot: render the 5+-char numeral squeeze (--rank-long) server-side so it survives a refresh — TDD

sea.js's _fillSlot adds .sea-card-slot--rank-long on draw (corner_rank length
>= 5) to squeeze long Roman numerals (XVIII, XLVIII, ...) into the slot, but
_my_sea_slot.html didn't — so a saved hand stretched the numeral back out on
refresh (server render). Add the same length>=5 class server-side. Fixes both
the owner picker + the spectator cross (shared partial). +3 ITs (long / short /
boundary).

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

src/apps/gameboard/tests/integrated/test_sea_visit.py

@@ -459,3 +459,32 @@ class MySeaVoiceContextTest(TestCase):
         self.client.force_login(self.owner)
         ctx = self.client.get(reverse("my_sea")).context
         self.assertFalse(ctx["voice_active"])
+
+
+class MySeaSlotRankLongTest(TestCase):
+    """The 5+-char Roman-numeral squeeze (`--rank-long`) is now rendered
+    server-side in `_my_sea_slot.html`, matching sea.js's `_fillSlot` length>=5
+    rule — so a saved hand keeps the narrowed numeral across a refresh instead
+    of stretching back out (user-reported 2026-05-29)."""
+
+    def _render(self, corner_rank):
+        from django.template.loader import render_to_string
+        return render_to_string("apps/gameboard/_partials/_my_sea_slot.html", {
+            "position": "lay",
+            "crossing": False,
+            "saved": {
+                "card_id": 1, "polarity": "gravity", "reversed": False,
+                "has_card_images": False, "corner_rank": corner_rank,
+                "suit_icon": "", "arcana": "", "image_url": "", "name": "",
+            },
+        })
+
+    def test_long_numeral_gets_rank_long(self):
+        self.assertIn("sea-card-slot--rank-long", self._render("XLVIII"))
+
+    def test_short_numeral_has_no_rank_long(self):
+        self.assertNotIn("sea-card-slot--rank-long", self._render("IV"))
+
+    def test_exactly_five_chars_gets_rank_long(self):
+        # Boundary matches the JS (length >= 5).
+        self.assertIn("sea-card-slot--rank-long", self._render("XVIII"))