<img width="1062" height="712" alt="image"
src="https://github.com/user-attachments/assets/44c82e00-94b4-405a-b2ef-cbc08401c4db"
/>
<img width="1583" height="962" alt="image"
src="https://github.com/user-attachments/assets/b19b9fd8-24b1-48d6-8b31-11fba9911b9a"
/>
## What kind of change does this PR introduce?
UI refinement.
## What is the current behavior?
The assistant sidebar and Explorer chat use different empty states.
## What is the new behavior?
Share a centered empty state with chat-focused prompts, use-case icons,
and a “Use your own agent” footer. Simplify prompt cards and align
Explorer Home styling.
## Additional context
Studio typecheck, targeted ESLint, and Prettier pass. E2E selectors
updated; browser verification pending. Local build stopped after showing
no progress during compilation.
I have read CONTRIBUTING.md.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Redesigned Explorer and AI Assistant onboarding with project-focused
chat prompts.
* Added personalized chat template icons and updated suggested actions.
* Added an option to connect and use an external agent through Claude,
OpenAI, or Cursor.
* Improved chat composer placement and empty-chat guidance.
* **Style**
* Action cards now support layouts without descriptions and adjust
alignment automatically.
* **Tests**
* Updated end-to-end coverage for the revised assistant interface.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## Context
Set up Explorer templates properly for notebooks and chat. Tried (with
the help of Claude) to come up with templates that are generic enough
for most projects to sort of pick up and use, or even pick up to study
how notebooks are meant to be used.
Feel free to play around on the preview to check out the content of each
template! 🙂
<img width="768" height="232" alt="image"
src="https://github.com/user-attachments/assets/590893c4-9772-437d-980f-05ea62ffef81"
/>
<img width="1918" height="955" alt="image"
src="https://github.com/user-attachments/assets/2114e73e-dc44-403d-a998-e87c8d328516"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added ready-to-use chat templates for sample data, security policies,
and notebook creation.
* Added notebook templates for database health, user growth, and error
investigation workflows.
* Explorer cards now dynamically create chats and notebooks from
selected templates.
* Templates include guided prompts, queries, logs, charts, and relevant
notebook content.
* **Bug Fixes**
* Improved generated log cell identifiers for more reliable notebook
creation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Saxon Fletcher