fix(editor-3001): fix tabs, error state, loading states

[EDsCODE]

Problem

• tabs get hidden when it passes the horizontal width
• no loading state

Changes

• make tabs scrollable
• add insight loader component from insights
• make sure when there's no query, don't fire an api call
• show query time
• don't reload between tabs

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

Does this work well for both Cloud and self-hosted?

How did you test this code?

[github-actions]

Size Change: 0 B

Total Size: 1.11 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.11 MB

_{compressed-size-action}

[posthog-bot]

📸 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 2)
• webkit: 0 added, 0 modified, 0 deleted

Triggered by this commit.

👉 Review this PR's diff of snapshots.