feat(ui): three-page console SPA on @unom/ui + the kit's react helpers

Overview (exporter health, Playnite version, counts, sync, live SSE activity,
and a first-run panel that names the exact ingest path the .pext writes to),
Library (covers + per-game include toggles + why-not-synced), Settings
(filters, art delivery, sync cadence, paths).

Data layer is AtomHttpApi atoms derived from the shared contract; the whole
thing runs with zero host against an in-browser mock transport with four
scenarios, and Storybook renders the real pages on the same fixtures. CI now
asserts the production bundle carries no fixture strings.

Also: CI rebuilt for the workspace layout (one root install, per-package
typecheck, publish from plugin/ on a v* tag) with the exporter job and
`publish: needs [build, exporter]` unchanged; README rewritten around the three
workspaces, with the ingest inbox explained as the load-bearing mechanism it is.

ui/vite.config.ts

@@ -0,0 +1,36 @@
+// Vite config for the plugin SPA. `base: "./"` because the console serves the built
+// bundle from /plugin-ui/playnite/ — asset URLs must stay relative to survive the proxy.
+// Dev has two modes (see src/mocks/): plain `bun run dev` runs entirely on fixtures,
+// `bun run dev:live` proxies /api to the plugin's dev server (plugin/src/dev.ts, :5886).
+
+import { fileURLToPath } from "node:url";
+import tailwindcss from "@tailwindcss/vite";
+import react from "@vitejs/plugin-react";
+import { defineConfig } from "vite";
+
+export default defineConfig({
+	base: "./",
+	plugins: [react(), tailwindcss()],
+	resolve: {
+		alias: { "@": fileURLToPath(new URL("./src", import.meta.url)) },
+	},
+	// Scan only the app entry — without this the dev dep-scanner also crawls any
+	// storybook-static/ build output sitting in the workspace and errors out.
+	optimizeDeps: { entries: ["index.html"] },
+	build: {
+		outDir: "../plugin/dist/ui",
+		emptyOutDir: true,
+	},
+	server: {
+		port: 5601,
+		...(process.env.VITE_API_MODE === "live"
+			? {
+					proxy: {
+						"/api": {
+							target: process.env.PLAYNITE_URL ?? "http://127.0.0.1:5886",
+						},
+					},
+				}
+			: {}),
+	},
+});