DRAW SEA async-transition FT: reload fallback for non-felt-save sky confirm — TDD

Running the corequisite channels FTs surfaced a real gap the cascade introduced:
a sky confirm that did NOT come through the felt's own save (a direct POST, or
another browser of the same seat) left _lastChartData null, so _onSkyConfirmed's
_activateSavedState returned early → no transition at all (the old code reloaded).

- _sky_overlay.html: _onSkyConfirmed now reloads when _lastChartData is absent
  (the pre-cascade behaviour, preserved for non-felt-save confirm paths); the
  felt-save path still eases to DRAW SEA via the cascade (no reload).
- test_game_room_select_sea.py: the async-transition assertion updated for the
  phase-stack — CAST SKY is now present-but-`--out` (hidden in the shared grid
  cell), not removed from the DOM, so assert the `hex-phase-btn--out` class on
  CAST SKY + its ABSENCE on DRAW SEA rather than `find_elements(...) == []`.

Corequisite FTs run green: select_sea async-transition (3) + deal (9) channels;
dash my_sky async-save + aperture-snap (3) — the shared body.sky-saved apparatus
is untouched by the room-scoped felt SCSS. select_sky FTs already green. The sig
SRG7 reveal FT is unaffected (it waits for the SIG_SELECT hidden CAST SKY, which
that branch still renders; it never clicks, so the _reload change isn't reached).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/templates/apps/gameboard/_partials/_sky_overlay.html

@@ -542,14 +542,19 @@
   }
 
   // ── Sky confirmed (self-targeted WS) ──────────────────────────────────────
-  // The acting gamer's own SAVE .then() already revealed the wheel; the WS
-  // event just re-asserts the saved state (idempotent). No reload — the gamer
-  // lingers on the saved wheel; the gear NVM does the navigation back to the
-  // hex (now DRAW SEA). A second browser of the same seat with no captured
-  // chart no-ops here (rare) and reconciles on its next load.
-
+  // Two cases:
+  //   • This browser captured the chart (the gamer saved via the felt) → the
+  //     save .then() already ran the cascade; this WS re-fire is idempotent
+  //     (re-asserts the saved state, no second cascade, no reload).
+  //   • No captured chart (a direct POST confirm, or another browser of the same
+  //     seat) → the cascade can't run, so reload to land on the server-rendered
+  //     DRAW SEA hex (the pre-cascade behaviour, preserved for these paths).
   function _onSkyConfirmed() {
-    _activateSavedState();
+    if (_lastChartData) {
+      _activateSavedState();
+    } else {
+      window.location.reload();
+    }
   }
 
   // ── DEL btn — JS-injected after the wheel paints; absent on a blank modal