feat(sessions): add channelIdleMinutes config for per-channel session idle durations (#1353)

* feat(sessions): add channelIdleMinutes config for per-channel session idle durations

Add new `channelIdleMinutes` config option to allow different session idle
timeouts per channel. For example, Discord sessions can now be configured
to last 7 days (10080 minutes) while other channels use shorter defaults.

Config example:
  sessions:
    channelIdleMinutes:
      discord: 10080  # 7 days

The channel-specific idle is passed as idleMinutesOverride to the existing
resolveSessionResetPolicy, integrating cleanly with the new reset policy
architecture.

* fix

* feat: add per-channel session reset overrides (#1353) (thanks @cash-echo-bot)

---------

Co-authored-by: Cash Williams <cashwilliams@gmail.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/infra/fetch.ts

@@ -31,8 +31,11 @@ export function wrapFetchWithAbortSignal(fetchImpl: typeof fetch): typeof fetch
     return response;
   }) as FetchWithPreconnect;
 
+  const fetchWithPreconnect = fetchImpl as FetchWithPreconnect;
   wrapped.preconnect =
-    typeof fetchImpl.preconnect === "function" ? fetchImpl.preconnect.bind(fetchImpl) : () => {};
+    typeof fetchWithPreconnect.preconnect === "function"
+      ? fetchWithPreconnect.preconnect.bind(fetchWithPreconnect)
+      : () => {};
 
   return Object.assign(wrapped, fetchImpl);
 }