added overlay function for tarot cards

app/data-service.js

@@ -254,6 +254,7 @@
       decansJson,
       sabianJson,
       planetScienceJson,
+      gematriaCiphersJson,
       iChingJson,
       calendarMonthsJson,
       celestialHolidaysJson,
@@ -269,6 +270,7 @@
       fetchJson(`${DATA_ROOT}/decans.json`),
       fetchJson(`${DATA_ROOT}/sabian-symbols.json`),
       fetchJson(`${DATA_ROOT}/planet-science.json`),
+      fetchJson(`${DATA_ROOT}/gematria-ciphers.json`).catch(() => ({})),
       fetchJson(`${DATA_ROOT}/i-ching.json`),
       fetchJson(`${DATA_ROOT}/calendar-months.json`),
       fetchJson(`${DATA_ROOT}/celestial-holidays.json`),
@@ -287,6 +289,9 @@
     const planetScience = Array.isArray(planetScienceJson?.planets)
       ? planetScienceJson.planets
       : [];
+    const gematriaCiphers = gematriaCiphersJson && typeof gematriaCiphersJson === "object"
+      ? gematriaCiphersJson
+      : {};
     const iChing = {
       trigrams: Array.isArray(iChingJson?.trigrams) ? iChingJson.trigrams : [],
       hexagrams: Array.isArray(iChingJson?.hexagrams) ? iChingJson.hexagrams : [],
@@ -352,6 +357,7 @@
       decansBySign: groupDecansBySign(decans),
       sabianSymbols,
       planetScience,
+      gematriaCiphers,
       iChing,
       calendarMonths,
       celestialHolidays,