ROLE SELECT: block role pick without deck; SigSelect qualifier spec fix — TDD

- role-select.js: _showNoDeckWarning(stack) intercepts at openFan() — fan never
  opens when data-equipped-deck=""; warning positioned fixed over card-stack via
  getBoundingClientRect(); .guard-actions wrapper for FYI/.btn-caution + NVM/.btn-cancel
- room.html: card-stack gains data-equipped-deck="{{ equipped_deck_id|default:'' }}"
- room view context: equipped_deck_id added
- _room.scss: .role-no-deck-warning — glass guard style matching #id_guard_portal
- _base.scss + _room.scss: guard portal + no-deck warning opacity 0.5 → 0.75
  (matches .tt tooltip; light-palette handled via --tooltip-bg CSS var)
- RoleSelectSpec.js: 8 Jasmine specs — no-deck (fan blocked, warning, FYI/NVM,
  no duplicate, no POST) + deck-present pass-through; afterEach cleans up warning
- SigSelectSpec.js: card fixture gains data-levity-qualifier + data-gravity-qualifier;
  all "Leavened" expectations updated to "Elevated"

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

src/static_src/scss/_base.scss

@@ -563,7 +563,7 @@ body {
     z-index: 10000;
     padding: 0.75rem 1rem;
     border-radius: 0.5rem;
-    background-color: rgba(var(--tooltip-bg), 0.5);
+    background-color: rgba(var(--tooltip-bg), 0.75);
     backdrop-filter: blur(6px);
     border: 0.1rem solid rgba(var(--secUser), 0.4);
     box-shadow: 0 0.25rem 1rem rgba(0, 0, 0, 0.4);