fix(market): route sectors/commodities to correct RPC endpoints (#2198)

* fix(fear-greed): add undici to scripts/package.json (ERR_MODULE_NOT_FOUND on Railway)

* fix(market): route sectors/commodities to correct RPC endpoints

fetchMultipleStocks called listMarketQuotes which reads market:stocks-bootstrap:v1.
Sector ETFs (XLK, XLF...) and commodity futures (GC=F, CL=F...) are NOT in that key,
so the live-fetch fallback always returned empty after the one-shot bootstrap hydration
was consumed, causing panels to show "data temporarily unavailable" on every reload.

Fix: add fetchSectors() -> getSectorSummary (reads market:sectors:v1) and
fetchCommodityQuotes() -> listCommodityQuotes (reads market:commodities-bootstrap:v1),
each with their own circuit breaker and persistent cache. Remove useCommodityBreaker
option from fetchMultipleStocks which no longer serves commodities.

* feat(heatmap): show friendly sector names instead of ETF tickers

The relay seeds name:ticker into Redis (market:sectors:v1), so the
heatmap showed XLK/XLF/etc which is non-intuitive for most users.

Fix: build a sectorNameMap from shared/sectors.json (keyed by symbol)
and apply it in both the hydrated and live fetch paths. Also update
sectors.json names from ultra-short aliases (Tech, Finance) to clearer
labels (Technology, Financials, Health Care, etc).

Closes #2194

* sync scripts/shared/sectors.json

* feat(heatmap): show ticker + sector name side by side

Each tile now shows:
  XLK              <- dim ticker (for professionals)
  Technology       <- full sector name (for laymen)
  +1.23%

Sector names updated: Tech→Technology, Finance→Financials,
Health→Health Care, Real Est→Real Estate, Comms→Comm. Svcs, etc.

Refs #2194

src/styles/main.css

@@ -5834,9 +5834,18 @@ body.playback-mode .status-dot {
   background: var(--surface);
 }
 
-.sector-name {
-  font-size: 9px;
+.sector-ticker {
+  font-size: 8px;
+  font-weight: 600;
   color: var(--text-dim);
+  letter-spacing: 0.03em;
+  opacity: 0.6;
+  margin-bottom: 1px;
+}
+
+.sector-name {
+  font-size: 8px;
+  color: var(--text-muted);
   margin-bottom: 2px;
 }