fix: tooltip positioning — measure after rAF, shift up minimally to fit

data/units.json

@@ -253,7 +253,9 @@
       "labelPlural": "fathoms",
       "symbol": "ftm",
       "group": "lengths-and-distance",
-      "toBase": 1828.8
+      "toBase": 1828.8,
+      "description": "The conversion of dickloads to fathoms is based on a 1' x 1' x 1ftm column of pure water at 4 degrees celsius. Obviously.",
+      "hidden": false
     }
   ],
   "groups": [
@@ -270,7 +272,7 @@
       "id": "lengths-and-distance",
       "label": "Lengths and Distance",
       "baseUnitId": "mm",
-      "toUniversal": 1,
+      "toUniversal": 14.2332177486,
       "alwaysShowLabel": false,
       "hidden": false
     }