…indow (#633)

Three bugs combine to burn 130% CPU when sidecar auth fails:

1. RefreshScheduler resets backoff multiplier to 1 (fastest) on error,
   causing failed endpoints to poll at base interval instead of backing off.
   Fix: exponential backoff on errors, same as unchanged-data path.

2. classify-event batch system ignores 401 (auth failure) — only pauses
   on 429/5xx. Hundreds of classify calls fire every 2s, each wasted.
   Fix: pause 120s on 401, matching the 429/5xx pattern.

3. Fetch patch retries every 401 (refresh token + retry), doubling all
   requests to the sidecar even when token refresh consistently fails.
   Fix: 60s cooldown after a retry-401 still returns 401.

Also shrinks settings window from 760→600px (min 620→480) to reduce
the empty whitespace below content on all tabs.

…indow (koala73#633)

Three bugs combine to burn 130% CPU when sidecar auth fails:

1. RefreshScheduler resets backoff multiplier to 1 (fastest) on error,
   causing failed endpoints to poll at base interval instead of backing off.
   Fix: exponential backoff on errors, same as unchanged-data path.

2. classify-event batch system ignores 401 (auth failure) — only pauses
   on 429/5xx. Hundreds of classify calls fire every 2s, each wasted.
   Fix: pause 120s on 401, matching the 429/5xx pattern.

3. Fetch patch retries every 401 (refresh token + retry), doubling all
   requests to the sidecar even when token refresh consistently fails.
   Fix: 60s cooldown after a retry-401 still returns 401.

Also shrinks settings window from 760→600px (min 620→480) to reduce
the empty whitespace below content on all tabs.