## Context
Sets up debouncing for notebooks search in the explorer so that we're
not hammering the API when searching
<img width="281" height="178" alt="image"
src="https://github.com/user-attachments/assets/1fa2d633-7f7f-4891-87cc-aa90a5062bb7"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Improved notebook search responsiveness by delaying searches until 500
ms after typing stops.
* Empty searches now update immediately.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## Context
Sets up infinite loading for notebooks with the `InfiniteListDefault`
component
Also adds the notebook and chats count on the explorer home nav
<img width="275" height="137" alt="image"
src="https://github.com/user-attachments/assets/c3f16e8f-f520-4107-a188-43b1abcca043"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Explorer navigation now displays accurate notebook and chat counts.
* Notebook lists support infinite scrolling, loading indicators, and
improved active-state styling.
* Notebook navigation remains available as additional items load.
* **Bug Fixes**
* Corrected default markdown cell formatting by removing unintended
leading spaces from headings and notes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Charis <26616127+charislam@users.noreply.github.com>
## Context
API changes are ready so hooking up the endpoints for full CRUD UX E2E
- Can create notebooks
- Can load notebooks
- Can delete notebooks
- Can update notebooks
## Context
Resolves FE-4074
Just adds scaffolding for the explorer UI - no data fetching yet.
Initializes the page + side nav, based off Saxon's POC in
`poc/explorer-prototype`
<img width="1389" height="500" alt="image"
src="https://github.com/user-attachments/assets/8f293992-97d9-403e-91d6-2e104cd20eb5"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## New Features
- Added a project Explorer page accessible from
`/project/:ref/explorer`.
- Added navigation for browsing notebooks and chats.
- Added search fields, back navigation, animated transitions, and empty
states for Explorer sections.
- Added a conditional Explorer link to the SQL Editor menu when enabled.
## Documentation
- Marked the Explorer route migration as complete in the migration
checklist.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Joshen Lim