tray tooltips: tilt persists while portal is open; PRV|NXT pinned to corners — TDD

- TrayTooltip adds .tt-active to the .tray-role-card / .tray-sig-card cell while its tooltip is open & removes it on _hide. The hover-tilt selectors gain .tt-active alongside :hover, :focus so the card stays tilted while the user is hovering the portal itself rather than the cell.
- #id_tooltip_portal: .fyi-prev / .fyi-next pinned to the bottom corners w. 1rem outside the panel (bottom: -1rem; left/right: -1rem) — same anchor the @stat-block-shared mixin uses for fan / sig / sea, restated here since the portal isn't covered by that mixin.
- 2 new TrayTooltipSpec specs (.tt-active added on hover, removed on _hide; for both role & sig branches).

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/static_src/scss/_tray.scss

@@ -152,9 +152,12 @@ $tray-bevel:    0.3rem;  // inner bevel ring; grid must sit inside this
     }
 
     // Hover/touch tilts the scrawl 7° counter-clockwise; :focus persists the
-    // tilt after a click (cell receives tabindex="0" from tray.js).
+    // tilt after a click (cell receives tabindex="0" from tray.js); .tt-active
+    // (set by TrayTooltip while the portal is open for this cell) keeps the
+    // tilt while the user is hovering the portal itself rather than the cell.
     &:hover > img,
-    &:focus > img {
+    &:focus > img,
+    &.tt-active > img {
         rotate: -7deg;
     }
 
@@ -184,7 +187,8 @@ $tray-bevel:    0.3rem;  // inner bevel ring; grid must sit inside this
         transition: rotate 0.25s ease;
     }
     &:hover > .sig-stage-card,
-    &:focus > .sig-stage-card {
+    &:focus > .sig-stage-card,
+    &.tt-active > .sig-stage-card {
         rotate: 7deg;
     }
 }