Cian Johnston ae8bed4d8e feat(site): improve DERP health page readability (#22984)
## Why

The DERP health page displayed raw field names like
`MappingVariesByDestIP`, `PMP`, `PCP`, `HairPinning` with no context.
Users without deep networking knowledge had no way to understand what
these flags meant or why they mattered. This change makes the page
self-documenting.

## What

- DERPPage (`/health/derp`)
- Replace flat pill row with four logically grouped tables:
**Connectivity**, **IPv6 Support**, **NAT Traversal**, **Port Mapping**.
  - Rename section from "Flags" to "Network Checks".
- Surface `CaptivePortal` flag (previously missing from the UI
entirely).
- Invert display of `MappingVariesByDestIP` and `CaptivePortal` so green
always means good.
- Handle `null` boolean fields (e.g. UPnP, PMP, PCP) with a distinct
"not checked" neutral icon.

- DERPRegionPage (`/health/derp/regions/:regionId`)
- Replace per-node `BooleanPill` row with a table showing **Exchange
Messages**, **Direct HTTP Upgrade**, **STUN Enabled**, and **STUN
Reachable** per node.
- Invert `uses_websocket` display as "Direct HTTP Upgrade" (green when
websocket is not needed).
- Surface **STUN Enabled** and **STUN Reachable** per node (data was
returned by the API but never rendered).
- Add null guards for `region` and `node` (remove `!` non-null
assertions).
- Convert all emotion/MUI styles to Tailwind classes; remove
`reportStyles` object and `useTheme` import.

- Content.tsx (shared)
- Adds an exported `StatusIcon` component with three states: `true`
(green check), `false` (red minus), `null` (neutral help icon).
2026-03-16 09:14:24 +00:00
2026-03-13 19:49:34 +01:00

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