feat(new-chanenls): remove raf, lower buffer

[synoet]

• chore(new-channels): remove raf lower buffer
• format

[coderabbitai]

Caution

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Walkthrough

Changes were made to two channel-related components. In ThreadList.tsx, the BASE_ITEM_SIZE constant was updated from 62 to 64, the BASE_BUFFER_SIZE calculation was simplified, and the initial scroll behavior was refactored to perform a single immediate scroll operation instead of multiple nested passes. The scroll handler now logs a warning when the virtualizer handle returns undefined, and a flex spacer element was added to the scroll container. In ChannelThread.tsx, an empty line was removed between two variable declarations with no functional impact.

Poem

🐰 A rabbit bounced with glee today,
As spacing grew and scroll improved the way,
One fewer line, one buffered space,
Makes threads load with steadier grace!
Constants tuned, with warnings clear,
Simplicity brings us all good cheer! 🌿

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main changes: removing nested requestAnimationFrame passes and lowering the buffer size from BASE_ITEM_SIZE * 10 to BASE_ITEM_SIZE.
Description check	✅ Passed	The description is related to the changeset, mentioning the removal of RAF (requestAnimationFrame) and buffer lowering, which aligns with the actual changes made.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch synoet/new-channels-remove-raf-lower-buffer

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