feat(admin): Replace the sidebar with region and page switchers

[onewland]

Replaces the sidebar with two switchers in the header, so every page gets the full width and moving around admin takes one hover.

Switch regions without losing your place

• The region pill lists every known region. Picking one opens the same page in that region. For example, from Querylog in us, choosing de lands on Querylog in de, so comparing a tool across regions no longer means re-navigating each time.
• The current region is marked. Links are normal links, so cmd-click opens a region in a new tab.
• Deployments with no other regions configured (e.g. local dev) show the region as a plain label.

Switch pages within the current region

• The current page title is now a menu of every tool you have access to, with the current page highlighted. This replaces the sidebar.
• The home page keeps its full tile grid and doesn't show a page title.

Both menus open on hover or keyboard focus.

Layout

• The sidebar (nav.tsx) and its styles are removed.
• Pages get padding now that the sidebar no longer offsets them from the edge.

Code

• The tile grid moves into a shared ToolGrid component (tool_grid.tsx), used by both the home page and the page menu.
• The sidebar's allowed-tools test is ported to ToolGrid. New header tests cover region links keeping the current page, the no-regions case, and the page menu.

Testing

• Jest suite passes (42 tests) and the bundle builds.
• Checked both menus in headless Chrome against mocked endpoints, including moving the pointer slowly from each trigger onto its menu.

Current state (QuickTime recording):
https://github.com/user-attachments/assets/cdfaa501-fce5-4a24-81c5-c251d6d151ee

🤖 Generated with Claude Code

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Shell overflows new body padding

Low Severity

Body spacing changed from a 10px margin to 20px padding, but the SQL shell still sizes itself with calc(100vh - 75px). The shell is now taller than the remaining content box, so the input row sits a few pixels below the fold on tracing and system shell pages.

 

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