[feat](trx-frontend-http): treat 00:00–00:00 time span as all-day entry

start == end previously matched nothing (empty range).  Now treated as a
24-hour window, making it easy to define a catch-all bookmark without
manually entering 00:00–23:59.

UI shows "All day / —" in the entries table and tooltip hints on both time
inputs explain the convention.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/scheduler.js

@@ -278,9 +278,10 @@
     entries.forEach(function (entry, idx) {
       const tr = document.createElement("tr");
       const il = entry.interleave_min ? String(entry.interleave_min) + " min" : "—";
+      const allDay = entry.start_min === entry.end_min;
       tr.innerHTML =
-        '<td>' + minToHHMM(entry.start_min) + '</td>' +
-        '<td>' + minToHHMM(entry.end_min) + '</td>' +
+        '<td>' + (allDay ? "All day" : minToHHMM(entry.start_min)) + '</td>' +
+        '<td>' + (allDay ? "—" : minToHHMM(entry.end_min)) + '</td>' +
         '<td>' + bmName(entry.bookmark_id) + '</td>' +
         '<td>' + escHtml(entry.label || "") + '</td>' +
         '<td>' + il + '</td>' +