fix(feed): add bottom padding to chronological feed filter pills

[dylanjeffers]

Summary

• The web FeedFilters component renders into the Header's bottomBar slot with no padding-bottom, leaving the All Posts / Original Posts / Reposts pills flush against the header's bottom border.
• Add pb='l' to give the pills breathing room before the page content begins, matching the pattern already used by the trending page's bottomBar and mirroring the existing paddingBottom: spacing.s on the mobile FeedFilters component.

Test plan

• Open the web app, sign in, navigate to Your Feed.
• With the Chronological tab selected, verify there is a clear gap between the filter pills (All Posts / Original Posts / Reposts) and the first track tile below — pills no longer sit flush against the header border.
• Switch to the For You tab and confirm the layout is unchanged (no bottomBar there).
• Toggle between filter pills and confirm the spacing remains consistent.

🤖 Generated with Claude Code

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