fix(firms): record source success after aggregation (#181)

Record FIRMS source success after appending its rows so aggregation failures do not produce contradictory source status. Cover large feeds, filtering, ordering and source failures with regression tests.

vite.config.js

@@ -2094,11 +2094,11 @@ function firmsProxy() {
     for (const source of SOURCES) {
       try {
         const records = filterTrailing24h(await fetchSource(key, source), now);
-        sources.push({ source, count: records.length, ok: true });
         // NOT fires.push(...records): spread passes each record as an argument,
         // and a world/2 VIIRS pull exceeds V8's argument limit (~125k) at
         // ~131k records — RangeError, and the whole source is silently dropped.
         for (const record of records) fires.push(record);
+        sources.push({ source, count: records.length, ok: true });
       } catch (err) {
         console.warn(`[firms-proxy] ${source} fetch failed:`, err?.message || err);
         sources.push({ source, count: 0, ok: false });