Agent log tabs could spill over the Copy/Download area, and the overflow
kebab sometimes never wired up because ResizeObserver ran with no node
or while inactive. This ties the hook to when the strip is real and
clips the tab column.
- `AgentRow`: `enabled` for `useKebabMenu` is `hasStartupFeatures &&
hasAnyLogs && showLogs`; `hasAnyLogs` is computed before the hook; tab
list wrapper gets `overflow-hidden`.
- `useKebabMenu`: attach `ResizeObserver` in `useLayoutEffect`; bail if
missing container or `!enabled || !isActive`; deps include `enabled` and
`isActive`.
- `TabsList` (`overflowKebabMenu`): add `min-w-0 w-full max-w-full` with
`flex-nowrap` so the list stays inside the flex column.
Jake Howell
074ff79af7