fix(logs): hide inactive Overview tab panel

Tailwind's `.flex` utility overrides the UA `[hidden]` rule, so applying
`flex` to SModalTabsContent caused the inactive Overview panel to still
participate in the Tabs flex column and push the Trace view down. Keep
SModalTabsContent as a plain overflow container (no `flex` class) with
the scroll ref on it, and restore the inner flex-col wrapper for the
Overview content so it still stacks with gap spacing.

Author: waleedlatif1