fix(video): render "Today" instead of "0 seconds ago" (#1091)

Video dates have day granularity, so a video published today humanized
to "0 seconds ago" — the symptom reported in #1091. video-age.js now
renders "Today" for any age below one day.

Add a server-side regression test pinning the contract the JS relies on
(a video dated today yields an age below one day in ms); the JS guard
itself has no unit test because the repo has no frontend build/test step.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jonfroehlich

website/static/website/js/video-age.js

@@ -54,6 +54,14 @@ const VideoAge = (function() {
     round: true  // Round to nearest unit
   };
 
+  /**
+   * Milliseconds in a day. Video dates have day granularity (server computes
+   * age from a DateField), so any age below this means "published today".
+   * Without this guard, a same-day video humanizes to "0 seconds ago" — the
+   * symptom reported in issue #1091.
+   */
+  const ONE_DAY_MS = 24 * 60 * 60 * 1000;
+
 
   // ==========================================================================
   // INITIALIZATION
@@ -134,9 +142,13 @@ const VideoAge = (function() {
    * 
    * @private
    * @param {number} ageInMs - Age in milliseconds
-   * @returns {string} Formatted string like "2 years ago"
+   * @returns {string} Formatted string like "2 years ago", or "Today" for a
+   *   video published today (avoids "0 seconds ago" — issue #1091)
    */
   function formatPastAge(ageInMs) {
+    if (ageInMs < ONE_DAY_MS) {
+      return 'Today';
+    }
     try {
       const humanized = humanizeDuration(ageInMs, HUMANIZE_OPTIONS);
       return humanized + ' ago';

website/tests/test_video.py

@@ -26,6 +26,18 @@ def test_past_date_returns_positive_int(self):
         # 7 days in ms, allowing slack for the now() call crossing midnight.
         self.assertGreaterEqual(age, 6 * 24 * 60 * 60 * 1000)
 
+    def test_today_is_below_one_day(self):
+        # A video published today must yield an age below one day in ms. This
+        # is the contract video-age.js relies on to render "Today" instead of
+        # "0 seconds ago" (issue #1091); pin it server-side since the JS guard
+        # itself has no test runner in this repo.
+        from website.models import Video
+        one_day_ms = 24 * 60 * 60 * 1000
+        age = Video(date=date.today()).get_age_in_ms()
+        self.assertIsInstance(age, int)
+        self.assertGreaterEqual(age, 0)
+        self.assertLess(age, one_day_ms)
+
     def test_future_date_returns_negative_int(self):
         from website.models import Video
         age = Video(date=date.today() + timedelta(days=7)).get_age_in_ms()