Fix timeline items being rerendered constantly

[7w1]

Description

So as Niki pointed out while working on galleries (i think?) timeline items rerender a lot. I never noticed, but uh, turns out this might matter for weaker devices, and comparing them side by side I do actually notice now.

We we're memoizing the components within timeline items, but the timeline items themselves we're being called every single scroll tick, which reduced the efficiency of that inner memoization quite a bit.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

AI disclosure:

• Partially AI assisted (clarify which code was AI assisted and briefly explain what it does).
• Fully AI generated (explain what all the generated code does in moderate detail).

[github-actions]

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Status	Preview URL	Commit	Alias	Updated (UTC)
✅ Deployment successful!	https://pr-1055-sable.raspy-dream-bb1d.workers.dev	47186d8	pr-1055	Sat, 11 Jul 2026 05:37:46 GMT