feat(commandcode): quota usage dashboard, CLI-parity request, and connect timeout fixes

- Add CommandCode usage handler mirroring the official CLI /usage
  (whoami → credits/subscriptions → summary) with 5h/weekly/monthly
  quota rows, registered in services/usage.js and registry config
- Parse commandcode quota rows in ProviderLimits (remainingPercentage + $ unit)
- Match official CLI request shape: x-command-code-version 1.10.0,
  User-Agent cli, and config.environment '${platform}-${arch}, Node.js ${version}'
- Fix connect timeout unit confusion: both profile and provider pages
  now use ms with a 1s minimum guard (prevents 60ms footgun)
- Fix fetchT0 ReferenceError in base.js error path and log fetch
  diagnostics only on upstream failure
- Quota Tracker defaults to the Active account filter
- Ignore .commandcode/ CLI local state

open-sse/executors/base.js

@@ -136,10 +136,11 @@ export class BaseExecutor {
       const timeoutMs = await resolveProviderTimeoutMs(this.provider, this.config?.timeoutMs, FETCH_CONNECT_TIMEOUT_MS);
       const connectTimer = setTimeout(() => connectCtrl.abort(new Error("fetch connect timeout")), timeoutMs);
       const mergedSignal = signal ? AbortSignal.any([signal, connectCtrl.signal]) : connectCtrl.signal;
+      let fetchT0 = 0;
 
       try {
         const bodyStr = JSON.stringify(transformedBody);
-        const fetchT0 = Date.now();
+        fetchT0 = Date.now();
         dbg("FETCH", `${this.provider.toUpperCase()} → ${url} | body=${bodyStr.length}B | connectTimeout=${timeoutMs}ms`);
         const response = await proxyAwareFetch(url, {
           method: "POST",
@@ -165,6 +166,11 @@ export class BaseExecutor {
         clearTimeout(connectTimer);
         lastError = error;
         const isConnectTimeout = connectCtrl.signal.aborted && error.name === "AbortError";
+        // Error diagnostic — only logs on actual upstream failure. Distinguishes
+        // undici connect timeout (UND_ERR_CONNECT_TIMEOUT), DNS (ENOTFOUND),
+        // refused (ECONNREFUSED) vs our own connectCtrl abort (AbortError).
+        const cause = error?.cause || {};
+        console.log(`[FETCH-DIAG] ${this.provider} fetch error | name=${error.name} | code=${error.code ?? cause?.code ?? "none"} | msg=${String(error.message).slice(0, 120)} | connectTimeout=${timeoutMs}ms | elapsed=${Date.now() - fetchT0}ms`);
         dbg("FETCH", `${this.provider.toUpperCase()} ✖ ${error.name}: ${error.message}${isConnectTimeout ? " (connect timeout)" : ""}`);
         // Connect timeout is internal — convert to retryable network error, don't propagate AbortError
         if (error.name === "AbortError" && !isConnectTimeout) throw error;