chore: better list visuals

[daibhin]

Problem

Refine the issue list visually

Changes

Before	After

[greptile-apps]

PR Summary

Added a Storybook file for the Sparkline component and made visual improvements to enhance the error tracking issue list interface.

• Added frontend/src/lib/components/Sparkline.stories.tsx for visual testing and documentation of the Sparkline component
• Added border radius (2px) to chart bars in Sparkline for rounded corners
• Removed y-axis border display in Sparkline for cleaner appearance
• Improved column alignment in error tracking list (right-align for volume, center for assignee)
• Enhanced VolumeColumn with flex container and right justification
• Added right padding to CustomGroupTitleColumn for better spacing
• Improved CountColumn styling with text-lg and font-medium classes

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[github-actions]

Size Change: 0 B

Total Size: 9.73 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	9.73 MB

_{compressed-size-action}

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📸 UI snapshots have been updated

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📸 UI snapshots have been updated

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📸 UI snapshots have been updated

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• webkit: 0 added, 0 modified, 0 deleted

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📸 UI snapshots have been updated

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• chromium: 0 added, 1 modified, 0 deleted (diff for shard 2)
• webkit: 0 added, 0 modified, 0 deleted

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📸 UI snapshots have been updated

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📸 UI snapshots have been updated

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📸 UI snapshots have been updated

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📸 UI snapshots have been updated

2 snapshot changes in total. 0 added, 2 modified, 0 deleted:

• chromium: 0 added, 2 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

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