docs: index the panel theme API reference

Author: SaKaNa-Y

docs/content/8.references/index.md

@@ -11,7 +11,7 @@ Lookup pages the guides link into:
 - [When Clauses](/references/when-clauses): the contexts and operators that gate docks, commands, and custom UI.
 - [Events Reference](/references/events): every event, broadcast, shared-state key, and channel name, by direction and reach.
 - [Node-Side API](/references/node-api): `DevframeDefinition` fields, CLI options, storage scopes, RPC function types, broadcast options, streaming lifecycle, remote assets, the `ctx.services` host and wire-service fields, diagnostics prefixes, and the auth surface.
-- [Browser-Side API](/references/browser-api): `connectDevframe` options, RPC client events, connection statuses, and in-page channel error codes.
+- [Browser-Side API](/references/browser-api): `connectDevframe` options, RPC client events, connection statuses, panel theme APIs, and in-page channel error codes.
 - [Hub API](/references/hub-api): hub subsystems, launcher fields, duplication strategies, dock categories, the hub UI protocol, the namespace routes, the client runtime, the client context, and dock entry types.
 - [Utilities](/references/utilities): the small, stable helpers under `devframe/utils/*`, bundled into `devframe`.
 - [Interactive Auth](/references/interactive-auth): the OTP auth recipe: handshake, resolver gate, connect-time trust, banner.