SSR chart images (#813)

* Initial progress

* Add more examples and docs

* Support passing background color as query param

* Fix SSR image support Grid, Axis, and Rule.  Add tests.  General improvements

* fix `pnpm check`

* Prerender chart API endpoints for Cloudflare compatibility and document edge runtime limitations

* Skip url.searchParams during prerendering to avoid SvelteKit build error

* Fix geo chart server-side rendering by converting GeoState projection from $effect.pre to $derived.by

* cleanup old changes.md

* Add geo SSR image example

* Add Sankey, Tree, and Treemap examples

* Improve treemap example (text/clip)

* Use `workspace:*` instead of `next` for `examples/*` projects to make sure `pnpm build:examples` is always using up to date library

* fix: improve compatibility with UnoCSS Svelte scoped preprocessing

* Remove unneeded changeset

* Reduce changeset level for stroke/fill improvements

Author: techniq

.changeset/axis-grid-stroke-fill-props.md

@@ -0,0 +1,5 @@
+---
+'layerchart': patch
+---
+
+feat: Add `stroke` and `fill` props to `Axis` and `Grid` for explicit color control (useful for SSR where CSS variables are unavailable)

.changeset/quiet-rabbits-listen.md

@@ -0,0 +1,7 @@
+---
+'layerchart': patch
+---
+
+fix: improve compatibility with UnoCSS Svelte scoped preprocessing
+
+- Remove TypeScript-only `as` assertions from exported Svelte markup in core mark components so preprocessors that parse markup expressions as plain JavaScript can consume packaged components without failing

.changeset/server-chart-rendering.md

@@ -0,0 +1,5 @@
+---
+'layerchart': minor
+---
+
+feat: Add `renderChart()` to `layerchart/server` for server-side chart-to-image rendering (PNG/JPEG)

changes.md

@@ -38,6 +38,7 @@
 		"@layerstack/svelte-table": "1.0.1-next.18",
 		"@layerstack/tailwind": "2.0.0-next.21",
 		"@layerstack/utils": "2.0.0-next.18",
+		"@napi-rs/canvas": "^0.1.97",
 		"@shikijs/transformers": "^4.0.2",
 		"@sveltejs/adapter-cloudflare": "^7.2.8",
 		"@sveltejs/kit": "^2.55.0",