position-circle tooltips: adversarial-review fixes — drop email leak, hide-on-hover-transition, surface #tokens, room_gate tooltip-only, N+1 hoist + specificity hardening — TDD

Follow-up to the position-circle tooltips sprint, addressing confirmed findings from a multi-agent adversarial review of the diff:

- Email leak (privacy): the hidden .slot-gamer span rendered the raw login email into DOM source on every filled circle — widened to room_gate this sprint. Now renders {{ gamer|at_handle }}; new IT asserts no occupant email anywhere in the page source.
- Stale hover state (position-tooltip.js): moving circle→circle accumulated .tt-pos-* classes on the portal (prior set never stripped), and circle→empty left the prior tooltip stranded. Now _hide() before _show() on every transition.
- Dead #tokens plumbing: data-tt-tokens was computed + rendered but never displayed. Surfaced as a .tt-tokens line in the portal.
- room_gate gather forms: the merged _gate_context let a CARTE owner drop/release gate slots from the renewal gate-view. Zeroed carte_next/nvm/is_last_slot so it's tooltip-only; new IT asserts no drop/release forms.
- N+1: hoisted the per-CARTE-slot token lookup into one carte_claims map; added select_related(significator) on seats + select_related(gamer) on gate_slots.
- SIG_SELECT seat override now gated on an EXPLICIT ?seat (no-param falls back to the canonical PC seat, not the lowest gate slot, so every SIG_SELECT surface agrees).
- Dropped dead is_self/is_bud dict keys (kept the locals + is_me_also).
- room-gate pointer-events override doubled to .room-gate-page.room-gate-page → (0,4,1), no longer a source-order tie with the (0,3,1) suppressor.

Tests: 11 position-tooltip FTs green (no skips); +2 ITs (no-email-in-source, room_gate-tooltip-only); full suite 1604 green. Deferred (noted in memory): in-UI seat switcher during SIG_SELECT, NVM-between-seats 409, gate_status/sea_partial enrichment split.

[[project-position-circle-tooltips]]

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

src/static_src/scss/_room.scss

@@ -361,8 +361,10 @@ html:has(.gate-backdrop) .position-strip .gate-slot form,
 html:has(.gate-backdrop) .position-strip .gate-slot button { pointer-events: auto; }
 // The room-gate renewal modal renders its OWN .gate-backdrop, but its
 // position circles are hover-only (tooltips) and must stay live — re-enable
-// them (equal specificity to the suppressor above, wins on source order).
-html .room-gate-page .position-strip .gate-slot { pointer-events: auto; }
+// them. The doubled `.room-gate-page` makes this (0,4,1) so it UNAMBIGUOUSLY
+// out-specifies the (0,3,1) suppressor above — not a fragile source-order tie
+// that a future SCSS reorder could silently flip. [[feedback-scss-import-order-specificity]]
+html .room-gate-page.room-gate-page .position-strip .gate-slot { pointer-events: auto; }
 
 .position-strip {
     position: absolute;