chore(3000): Clean up support panel

[Twixes]

Changes

Addressing #18931 (comment):

Before	After

Note how the panel button shadows now point and behave the same way as all other buttons in the UI.

[github-actions]

Size Change: 0 B

Total Size: 1.83 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.83 MB

_{compressed-size-action}

[posthog-bot]

📸 UI snapshots have been updated

4 snapshot changes in total. 0 added, 4 modified, 0 deleted:

• chromium: 0 added, 4 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

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[benjackwhite]

Pretty sure David's PR changes these to be the tertiary style which arguably fits better ....

[posthog-bot]

📸 UI snapshots have been updated

3 snapshot changes in total. 0 added, 3 modified, 0 deleted:

• chromium: 0 added, 3 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

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[posthog-bot]

📸 UI snapshots have been updated

1 snapshot changes in total. 0 added, 1 modified, 0 deleted:

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

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👉 Review this PR's diff of snapshots.