refactor: extract apply_applet_toggle, rooms_for_user & natus helpers to utils; DRY toggle views

- epic/utils.py (new): _planet_house, _compute_distinctions, rooms_for_user
- applets/utils.py: apply_applet_toggle replaces 5 copy-pasted toggle loops
- dashboard/views.py: use apply_applet_toggle; fix double free_tokens/tithe_tokens query in wallet(); promote _compute_distinctions import to module level
- gameboard/views.py: use apply_applet_toggle & rooms_for_user; fix double free_tokens query in toggle_game_applets
- billboard/views.py: use apply_applet_toggle & rooms_for_user
- SCSS: %tt-token-fields placeholder in _tooltips.scss; _gameboard & _game-kit @extend it
- epic/tests/unit/test_utils.py (new): coverage for _planet_house fallback path

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/epic/tests/unit/test_utils.py

@@ -0,0 +1,13 @@
+from django.test import SimpleTestCase
+
+from apps.epic.utils import _planet_house
+
+
+class PlanetHouseFallbackTest(SimpleTestCase):
+    def test_returns_1_when_no_cusp_matches(self):
+        # Pathological cusps list: all 12 cusps identical (zero-width arcs).
+        # No range has start < end, and the wrap-around condition is also
+        # never satisfied, so the loop exhausts without returning — hitting
+        # the fallback `return 1`.
+        cusps = [0.0] * 12
+        self.assertEqual(_planet_house(180.0, cusps), 1)