Remove inspector toggle animations

[aidxun]

What changed:

• Removed the explicit panel-toggle animation path from the inspector sidebar sections.
• Simplified the inspector layout and hook flow by dropping the toggle animation state and related props.
• Updated the App test to assert the new static chevron transition behavior.

Why:

• The inspector toggle animation was unnecessary complexity and made the section behavior harder to reason about.
• Removing it keeps the sidebar layout simpler and avoids maintaining motion state that no longer adds value.

Follow-up / test notes:

• fixes: Improve inspector expand/collapse animation performance #446
• bun run typecheck
• bun run test:frontend
• The branch was already pushed to the writable fork remote; upstream origin push is not available in this environment.

[vercel]

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