Implement v0.4 subscriptions + v0.5 theming and plugin slots

- SSE and WebSocket fetchers via graphql-sse and graphql-ws,
  returning AsyncIterable results
- SessionStore.run consumes AsyncIterable streams with
  subscriptionMode "append" (timestamped) or "replace" and
  honors an AbortSignal for cancellation
- Chrome CSS variables documented in styles/theme.scss with
  prefers-color-scheme light/dark gating and .graphiql-light override
- Svelte 5 snippet slots on GraphiQL: toolbarExtras, tabExtras,
  resultFooter

1 files changed, 47 insertions, 0 deletions

diff --git a/source/library/styles/theme.scss b/source/library/styles/theme.scss
new file mode 100644
index 0000000..55f24aa
--- /dev/null
+++ b/source/library/styles/theme.scss
@@ -0,0 +1,47 @@
+// @eol/graphiql chrome theme variables.
+//
+// Override any variable under a scoped selector (e.g. `.graphiql`) or on :root
+// to re-skin the chrome. The editor theme is a separate prop (`theme?: Extension`).
+//
+// Supported variables:
+//   --graphiql-accent        primary action color (Run button, selected state)
+//   --graphiql-bg            base background (editor + result)
+//   --graphiql-border        divider lines between panes
+//   --graphiql-fg            primary foreground
+//   --graphiql-font          font-family for the chrome
+//   --graphiql-link          clickable links in docs / breadcrumbs
+//   --graphiql-muted         muted foreground (hints, timestamps)
+//   --graphiql-panel         panel background (toolbar, tabbar, headers)
+
+:root {
+  --graphiql-accent: #0e639c;
+  --graphiql-bg: #1e1e1e;
+  --graphiql-border: #333;
+  --graphiql-fg: #d4d4d4;
+  --graphiql-font: ui-monospace, SFMono-Regular, monospace;
+  --graphiql-link: #79b8ff;
+  --graphiql-muted: #858585;
+  --graphiql-panel: #252526;
+}
+
+@media (prefers-color-scheme: light) {
+  :root:not(.graphiql-dark) {
+    --graphiql-accent: #0366d6;
+    --graphiql-bg: #ffffff;
+    --graphiql-border: #e1e4e8;
+    --graphiql-fg: #24292e;
+    --graphiql-link: #0366d6;
+    --graphiql-muted: #6a737d;
+    --graphiql-panel: #f6f8fa;
+  }
+}
+
+:root.graphiql-light {
+  --graphiql-accent: #0366d6;
+  --graphiql-bg: #ffffff;
+  --graphiql-border: #e1e4e8;
+  --graphiql-fg: #24292e;
+  --graphiql-link: #0366d6;
+  --graphiql-muted: #6a737d;
+  --graphiql-panel: #f6f8fa;
+}