### Context
Adds context menu to the explorer nav to allow users to delete notebooks
or chats from there (instead of having to open the notebook / chat
first, then select delete from the header)
<img width="304" height="339" alt="image"
src="https://github.com/user-attachments/assets/2ad0f21c-0d49-407c-97a2-ef11ae59e280"
/>
### Changes involved:
- Consolidates the rendering of explorer nav items into a single
component that both `ExplorerNavNotebook`, `ExplorerNavHome` and
`ExplorerNavChats` use.
- We were previously rendering a link for notebook, and a button for
chats. But chats' button was just calling `router.push` under the hood.
- Opting to use a Context to handle the delete functionality such that
we can render the confirmation modal just once at the layout level since
there's multiple places that have this delete functionality - notebook
tab, chat tab, context menu in each of the explorer navs
### To test
- [ ] Verify that navigating around the explorer is status quo
- [ ] Verify that you can delete a notebook/chat from within the
notebook/chat tab
- [ ] Verify that you can delete a notebook/chat from the explorer nav
- [ ] Verify that after deleting a notebook/chat from either locations,
the tabs should clear
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Unified chat and notebook navigation with direct links and active-item
highlighting.
- Added context-menu options to delete chats and notebooks with
confirmation and status notifications.
- Added double-click support for keeping recently viewed chats and
notebooks open as tabs.
- Deleted items and their related tabs are removed automatically.
- **Tests**
- Updated Explorer navigation tests for the unified link-based item
behavior.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Moves Explorer’s back navigation and create actions into a reusable
sidebar breadcrumb header. Reduces product-menu headings globally to
`text-sm` and keeps breadcrumb links free of padding, borders, and
backgrounds.
### How to test
1. Open `/project/<ref>/explorer` and confirm the header shows Explorer
and the SQL Editor switch action.
2. Open Notebooks and Chats. Confirm the header shows `Explorer >
Notebooks/Chats` and the corresponding create action works.
3. Return using the Explorer breadcrumb with a click or Tab + Enter.
Check that the label stays aligned and has no hover background.
4. Open another product, such as Database, and confirm its sidebar
heading uses the smaller font size.
5. At a mobile viewport, open the menu and repeat the notebook/chat
actions and back navigation without closing the sheet. Confirm the
header stays current and disappears when returning to the main menu or
opening another product.
Validation: 18 focused tests, typecheck, formatting, and lint ratchet
passed.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Added a shared Explorer sidebar header with breadcrumbs and contextual
actions for creating notebooks and chats.
- Added keyboard-accessible navigation between the Explorer overview and
notebook or chat sections.
- Added support for customized product menu headers across project
layouts.
- **Improvements**
- Centralized Explorer navigation and actions in the shared sidebar
layout.
- Improved mobile menu updates when navigating between Explorer
resources.
- Refined Explorer home layout and drag-handle behavior across screen
sizes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Joshen Lim <joshenlimek@gmail.com>
<img width="1693" height="1038" alt="image"
src="https://github.com/user-attachments/assets/9ef52446-c517-4ea9-ada6-ac6dc57c8af4"
/>
## Summary
- add an Explorer-specific chat toolbar with rename, chat ID,
permission, and branching controls
- list searchable non-support chats in Explorer with reactive updates
and safe rehydrated-date sorting
- add chat creation entry points to Explorer home and navigation menus
- route chat recent items correctly and show chat icons across shared
tab surfaces
- make the assistant sidebar expand action open the active chat in
Explorer
This is PR 3 of 3 and is stacked on #49031. Review #48973 first, then
#49031, then this PR. Compared with its base, this PR contains only
discovery, toolbar, and cross-surface integration work.
## To Test
- visit /explorer
- Create a new chat either via home tab chat input OR the chats sidebar
- Validate chats show up in sidebar
- Validate chat conversation works
- Close the chat tab and open a chat via sidebar
- Change permission settings via the chat tab toolbar and verify it
persists
## Test plan
- `mise exec node@22 -- pnpm --dir apps/studio exec tsc --noEmit`
- focused Vitest suite: 4 files / 5 tests covering reactive chat lists,
navigation filtering and sorting, recent-item routing, and sidebar
handoff
- ESLint on changed TypeScript files
- Prettier check on changed source files
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Added chat creation from the Explorer home, navigation, and new-tab
menu.
- Added an Explorer chat toolbar with editable names, ID copying,
permissions, shortcuts, and metadata warnings.
- Added searchable chat history with sorting, active-chat highlighting,
and clear empty states.
- Chats can now open directly in Explorer from the AI Assistant panel.
- Recent items now link correctly to chats and notebooks.
- **Bug Fixes**
- Improved chat list updates after creation, deletion, and restored
sessions.
- Added safer handling for chats without update timestamps.
- **Tests**
- Expanded coverage for chat navigation, creation, metadata warnings,
shortcuts, and recent-item links.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Joshen Lim