fix(feed): anchor filter button to the right side, match Trending pattern

[dylanjeffers]

Summary

The feed filter button (the dropdown next to the Chronological tab) was sitting inline next to the feed tabs in the Header's rightDecorator slot, instead of being anchored to the right edge of the header like Trending does.

Move both the FeedTabs and FeedFilters from rightDecorator into the Header bottomBar slot, wrapped in <Flex w='100%' justifyContent='space-between'> — this is the exact pattern TrendingPageContent uses (tabs on the left, filter buttons on the right). The mobile-web header gets the equivalent change: justifyContent flips from center to space-between with w='100%', so the filter is pushed to the right edge.

When the For You tab is active there is no filter button — only the tabs render — which matches existing behavior.

This supersedes #14315, which introduced the filter button but kept it clumped next to the tabs.

Files changed

• packages/web/src/pages/feed-page/components/desktop/FeedPageContent.tsx — rightDecorator → bottomBar with space-between
• packages/web/src/pages/feed-page/components/mobile/FeedPageContent.tsx — justifyContent='center' → space-between with w='100%'

Test plan

Note: the dev server was not available in this worktree, so the change has not been visually verified in a browser yet. The diff is a structural prop change (slot + flex alignment) — no logic, no new components.

• Desktop: open feed page, Chronological tab → confirm the filter button sits at the right edge of the header (not next to the tabs), tabs are on the left, separated by full-width space-between
• Desktop: switch to For You → confirm filter button is hidden, only tabs render
• Desktop: open the filter dropdown → confirm All Posts / Original Posts / Reposts options work and filter the lineup
• Mobile-web: repeat the above checks — filter button should sit at the right edge of the header

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