Updated the ui of aerograph and added a dark mode feature in it.

[lalmayank]

Summary

What changed, and why?

Affected Packages

• packages/contracts
• packages/sdk
• packages/adapter-langchain
• apps/collector
• apps/web
• apps/demo

If the change touches multiple packages, list them here and note any dependency order.

Screenshots

• Not applicable
• Included below

If the UI changed, include screenshots or a short recording.

Test Evidence

List the commands you ran and the outcome.

• npm run build
• npm test

Replay and Determinism

• I checked whether this change affects replay behavior.
• I verified the change remains deterministic for the same input.
• I added or updated tests for any replay-sensitive path.

Schema Compatibility

• No schema changes
• Schema changes are backward compatible
• Schema changes require coordination

Describe any contract, payload, or storage changes here.

Migration Notes

If this change needs follow-up work, document the upgrade or rollout path.

Breaking Changes

• This change is not breaking
• This change includes a breaking change

If breaking, describe the migration path and any follow-up work.

Checklist

• The change is focused and ready for review.
• I updated tests or explained why no test update was needed.
• I reviewed the diff for accidental schema or replay regressions.