PICK SEA reversal axis: server-side roll + preview + deposited slot — TDD

- new apps/epic/utils.STACK_REVERSAL_PROBABILITY (=0.25) + stack_reversal_probability(user, room) helper; single source of truth across game phases & one-line swap point for forthcoming per-user-profile config
- sea_deck view rolls each card's `reversed` axis at fetch time using the helper, attaches to card JSON; matches the eager shuffle pattern (whole deal determined at phase start)
- room_view + sea_partial pass `stack_reversal_pct` into context for the new <p class="sea-reversal-hint">25% reversals</p> hint above the SPREAD combobox (italic, 0.7rem, 0.55 opacity)
- SeaDeal.openStage applies .stage-card--reversed + .is-reversed to stat block when card.reversed → preview lands face-reversed w. REVERSAL keywords
- _fillSlot adds .sea-card-slot--reversed → slot itself rotates 180° (bg + border + content stack flips, not just inner chars upside-down in place); .sea-pos-cross overrides to 270° to compose w. its existing 90°
- _fillSlot adds .sea-card-slot--rank-long when corner_rank.length ≥ 5 (XVIII / XXIII / XXVIII / XXXIII / XXXVIII / XLIII / XLVIII) → SCSS scaleX(0.7) + letter-spacing -0.05em squeezes horizontally w.o changing font-size

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/epic/utils.py

@@ -3,6 +3,28 @@ from django.db.models import Q
 from apps.epic.models import Room, RoomInvite
 
 
+# ── Game-wide constants ────────────────────────────────────────────────────
+# Reversal probability applied to any card pulled from a stack, anywhere in
+# the game (PICK SEA initially; future phases — gameplay draws etc. — will
+# share this single source of truth). Stub for a future per-user profile
+# override: callers MUST go through stack_reversal_probability(user, room)
+# rather than referencing the constant directly so the user-config hookup is
+# a one-line change inside the helper.
+STACK_REVERSAL_PROBABILITY = 0.25
+
+
+def stack_reversal_probability(user=None, room=None):
+    """Reversal probability for a draw stack in this user's context.
+
+    Current behavior: returns the module default for everyone. Plumbing point
+    for a forthcoming per-user setting — when that lands, swap the body to
+    something like `return getattr(user.profile, 'reversal_rate', STACK_REVERSAL_PROBABILITY)`
+    and every call site picks up the per-user value automatically.
+    """
+    return STACK_REVERSAL_PROBABILITY
+
+
+
 def _planet_house(degree, cusps):
     """Return 1-based house number for a planet at ecliptic degree.