036e7ed7e8
Per Codex: HubBar stays purely site-level, so the feed's own utilities live with the feed. Beside the existing Search toggle (hub chrome only, so `/`'s Header keeps its own — no duplication): a Saved button (opens the existing flyout) and a Boundaries/Tune control with a visible active indicator (links to its account section for now). Same pill styling as Search. Also flagged the Back-condition trap in-code: once bare /news becomes Latest, Back must be suppressed for 'latest' too (only genuine drill-ins show it) — to be fixed at the behavior split, not now (would alter the frozen `/`). 32 tests green; build clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>