feat: fix spacing in gene expression

[joyceyan]

Reason for Change

https://app.zenhub.com/workspaces/single-cell-5e2a191dad828d52cc78b028/issues/gh/chanzuckerberg/single-cell-data-portal/5837

Changes

adds the proposed changes to gene expression spacing. note that as @karenliang0 notes in the ticket, the changes to shift the alignment of the cell type search bar would be in a separate ticket, so that's not in this PR.

Testing steps

static screenshot to verify pixel padding

easiest way to review would be to just look at the rdev: https://pr-6214-frontend.rdev.single-cell.czi.technology/gene-expression

Checklist 🛎️

TODO

• Add product, design, and eng as reviewers for rdev review

• For UI changes, add screenshots/videos, so the reviewers know what you expect them to see

• For UI changes, add e2e tests to prevent regressions

i don't think e2e tests are necessary for moving stuff 4 pixels here and there

Notes for Reviewer

[github-actions]

Deployment Summary

• backend_url: https://pr-6214-backend.rdev.single-cell.czi.technology
• frontend_url: https://pr-6214-frontend.rdev.single-cell.czi.technology
• delete_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-6214-deletion:1
• migrate_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-6214-migration:1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7b6ea61) 91.60% compared to head (4020401) 91.60%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6214   +/-   ##
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  Coverage   91.60%   91.60%           
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  Files         175      175           
  Lines       14232    14232           
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  Hits        13037    13037           
  Misses       1195     1195           

Flag	Coverage Δ
unittests	91.60% <ø> (ø)

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[kaloster]

LGTM!