Add watch/phone icons and logo, reorder the interpretation report, and stamp every report with the day it's for

engine/src/reading.c

@@ -5,6 +5,7 @@
 
 void reading_generate(const char *tarot_seed, const BirthData *birth,
                        time_t utc_moment, DailyReading *out) {
+  out->utc_moment = utc_moment;
   astro_compute_natal_chart(birth, &out->natal);
   astro_compute_daily_transits(utc_moment, &out->natal, &out->transits);
   tarot_draw_celtic_cross(tarot_seed, &out->spread);
@@ -160,6 +161,9 @@ static void print_body_position_json(FILE *out, const char *indent, Body body,
 void reading_print_json(const DailyReading *r, FILE *out) {
   fprintf(out, "{\n");
 
+  struct tm *utc = gmtime(&r->utc_moment);
+  fprintf(out, "  \"date\": \"%04d-%02d-%02d\",\n", utc->tm_year + 1900, utc->tm_mon + 1, utc->tm_mday);
+
   fprintf(out, "  \"natal\": {\n    \"bodies\": [\n");
   for (int b = 0; b < NUM_BODIES; b++) {
     print_body_position_json(out, "      ", (Body)b, &r->natal.bodies[b]);

engine/src/reading.h

@@ -15,6 +15,12 @@
 #include "tarot.h"
 
 typedef struct {
+  /* The moment passed to reading_generate() - the day this reading is
+   * for, not when it happened to be generated. Set by reading_generate()
+   * itself, so every caller (CLI, watch, reading_load_json() on the
+   * interpreter side) gets it for free without threading it through
+   * separately. */
+  time_t utc_moment;
   NatalChart natal;
   DailyTransits transits;
   CelticCrossSpread spread;