Sea Select: rebuild as a felt + Gaussian spread modal, unify w. my_sea — TDD

Hollow out the gameroom DRAW SEA dark modal into the two surfaces my_sea
uses: a --duoUser felt (.sea-page--room) filling the hex pane where the
Celtic Cross deals, + a Gaussian spread modal (#id_sea_spread_modal: the
.sea-select combobox w. the two Celtic Cross 6-card opts ONLY, AUTO DRAW/DEL,
a mini preview, + a corner #id_sea_cancel NVM). Opened by DRAW SEA
(html.sea-open); the room gear's NVM (room-menu-sea) returns to the hex;
#id_text_btn + #id_sky_btn go inert while the felt is open.

- persist: epic:sea_save / sea_delete upsert the seat's Character.celtic_cross
  (none of my_sea's MySeaDraw quota/Brief machinery); room ctx adds
  saved_by_position + saved_sea_spread + sea_default_spread + hand_complete so
  a reload re-renders the filled cross. celtic_cross field already existed (no
  migration)
- mini spread preview (_sea_spread_preview.html) in BOTH the gameroom + my_sea
  modals — shape only, NEVER dealt to: SeaDeal scopes its slot queries to
  .sea-cross:not(.sea-cross--preview)
- always TWO deck stacks (Gravity + Levity) in the room Sea Select — the gamer
  draws from either populated half (sea_deck split), even a CARTE monodeck;
  unlike my_sea / Sig Select's polarization collapse
- glow coordination: the sky-saved glow is muted in the sky/sea phases
  (html.sky-open / sea-open / sea-entered); sea glow color --priYl -> --priId
  (distinct from sky's --priTk); the sea glow-machine fires at hand-COMPLETION
  (mirrors Sky Select), not during drawing
- guard copy "Auto deal cards?" -> "Auto Draw cards?" (match the AUTO DRAW btn)
- fix: drop the stale `html.sea-open #id_aperture_fill { opacity:1 }` — it
  painted the opaque z-90 fill over the z-5 felt so the spread flashed then
  vanished (same trap as the CAST SKY felt); removed the dead .sea-backdrop /
  .sea-overlay / .sea-modal-* SCSS
- tests: epic PickSeaPersistTest (7) + PickSeaUnifiedFeltTest (6) ITs; SeaDeal
  preview-scoping + BurgerSpec sky-glow-mute Jasmine specs; my_sea sig-card
  ITs scoped to .my-sea-cross (the preview adds a 2nd .sea-sig-card)

[[feedback-felt-aperture-fill-covers-felt]]
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/static_src/scss/_room.scss

@@ -39,10 +39,15 @@ html:has(.gate-backdrop) {
 
 html:has(.gate-backdrop) #id_aperture_fill,
 html:has(.sig-backdrop) #id_aperture_fill,
-html:has(.role-select-backdrop) #id_aperture_fill,
-html.sea-open #id_aperture_fill {
+html:has(.role-select-backdrop) #id_aperture_fill {
     opacity: 1;
 }
+// NB: `html.sea-open #id_aperture_fill { opacity: 1 }` was DROPPED in the felt
+// rebuild (2026-06-07). The DRAW SEA felt now sits at z-5 INSIDE the hex pane
+// (.sea-page--room), BELOW the z-90 fill — lighting the fill painted an opaque
+// green sheet OVER the felt + spread (the 0.15s opacity transition is why the
+// spread "flashed then vanished"). Same trap + fix as the CAST SKY felt.
+// [[feedback-felt-aperture-fill-covers-felt]]
 
 // ─── Table-hex aperture: binary scroll-snap toggle ─────────────────────────
 // Mirrors my_sky's wheel<->form swap (`_sky.scss` body.sky-saved block). The
@@ -103,6 +108,13 @@ html.sky-open .room-aperture.is-scrollable {
     scroll-snap-type: none;
 }
 
+// Same pin while the DRAW SEA felt is summoned (html.sea-open) — the felt fills
+// the hex pane + the reelhouse below must stay out of reach.
+html.sea-open .room-aperture.is-scrollable {
+    overflow-y: hidden;
+    scroll-snap-type: none;
+}
+
 .room-scroll-pane {
     display: flex;
     flex-direction: column;