## What kind of change does this PR introduce?
Bug fix: custom icons now respect their source SVG’s stroke/fill and
stroke-width instead of always getting a global stroke.
## What is the current behavior?
Every custom icon gets `stroke="currentColor"` and `strokeWidth={2}`
from `createSupabaseIcon`, so fill-only logos get an extra stroke and
icons designed at `stroke-width="1"` (e.g. postgres, auth) render too
thick. Call sites and the design-system grid needed workarounds
(`strokeWidth={0}`, `FILL_ONLY_ICONS`, `STROKE_WIDTH_FROM_SOURCE`).
## What is the new behavior?
The icon build reads root SVG attributes (`fill`, `stroke`,
`stroke-width`, etc.) and passes them as per-icon defaults. Fill-only
icons (chatgpt, claude, axiom, last9) have `stroke="none"` in source and
render with no stroke; stroke icons keep their source stroke-width (e.g.
postgres at 1). No `strokeWidth={0}` or allowlists needed at call sites
or in the icon grid.
| Before | After |
| --- | --- |
| <img width="1826" height="552" alt="CleanShot 2026-03-05 at 10 53
31@2x-3D63CEF0-1132-44F5-A382-730346432F1E"
src="https://github.com/user-attachments/assets/9caf73fa-351b-4ea2-a420-b3339f934742"
/> | <img width="1814" height="552" alt="CleanShot 2026-03-05 at 10 53
40@2x-514FC8BD-D30F-4D23-B209-0ECD6D13A184"
src="https://github.com/user-attachments/assets/936ea5a5-dae0-413f-8545-b90a502cea69"
/> |
## Additional context
- Added `stroke="none"` to the four fill-only source SVGs;
sentry/grafana/otlp/datadog already had `stroke-width="0"`.
- `createSupabaseIcon` only applies `color`/`strokeWidth` when the
consumer passes them, so `svgDefaults` from the build are used
otherwise.
- Removed workarounds from `icons.tsx` and GuidesSidebar; updated
icons.mdx (defaults + fill-only guidance).
