[test](trx-frontend-http): read the statistics counters past their formatting

The new assertion parsed the decode counter with Number() on its text.  The
counters are written with toLocaleString(), so the 1220 records the history
fixture serves arrive as "1,220" and the parse gave NaN.  It passed here and
failed on CI because the count in the local repro was 18 — below the point
where grouping appears — and the runner's locale groups where mine did not.

Read the digits and ignore the separator, whichever one the locale picks.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SyX26FCpMQxiBoC7r5K1A7
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/decode-flow.mjs

@@ -270,10 +270,13 @@ try {
   // on the tab (module loaded at startup, before the history) to show the lot.
   await replay.page.evaluate(() => window.navigateToTab("statistics"));
   await replay.page.waitForTimeout(1500);
-  const counted = await replay.page.evaluate(() => ({
+  // The counters are written with toLocaleString(), so a four-figure count
-    decodes: Number(document.getElementById("stats-total-decodes")?.textContent ?? "0"),
+  // arrives as "1,220" — whichever separator the runner's locale picks. Read
-    grids: Number(document.getElementById("stats-unique-grids")?.textContent ?? "0"),
+  // the digits rather than the formatting.
-  }));
+  const counted = await replay.page.evaluate(() => {
+    const count = (id) => Number((document.getElementById(id)?.textContent ?? "").replace(/\D/g, ""));
+    return { decodes: count("stats-total-decodes"), grids: count("stats-unique-grids") };
+  });
   assert.equal(counted.decodes, HISTORY_AIS + HISTORY_APRS + HISTORY_FT8 + HISTORY_WSPR,
     `the statistics counted ${counted.decodes} decodes`);
   // Grid squares come from the FT8 and WSPR spots, which had no map replay of