fix: scroll left sidebar to 'now' indicator on initial load

[devin-ai-integration]

fix: scroll left sidebar to 'now' indicator on initial load

Summary

Fixes the left sidebar scroll position to default to showing "now" (the red line indicator) instead of requiring users to scroll down when they have calendar events synced.

The issue was that the initial scroll effect ran before the anchorNode (the DOM element for the "now" indicator) was available. The scroll function returns early when anchorNode is null, so the initial scroll never happened.

The fix waits for anchorNode to be available before attempting the initial scroll by adding it to the effect's dependency array and checking for its presence.

Review & Testing Checklist for Human

• Test with calendar events synced - verify the sidebar scrolls to the red "now" line on app launch
• Test without calendar events - verify the sidebar still behaves correctly
• Test scrolling away from "now" and verify the "Go back to now" button still works

Notes

• This change was not tested locally due to the time required to run the desktop app
• Link to Devin run: https://app.devin.ai/sessions/570548477722420e9050c03eedc1936f
• Requested by: @ComputelessComputer

[devin-ai-integration]

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