init: arcadia-admin — admin webapp for arcadia-core, cloned from vibespace

Initial commit. Spun up via the docs/STARTER.md recipe: cp from vibespace,
reset git, rename package, set brand to "Arcadia Admin" with Shield icon
in app/lib/identity.ts.

Inherits the full Crema sibling-lib wiring including @crema/arcadia-client
(typed HTTP + Phoenix Channels realtime against arcadia-core) and
@crema/arcadia-auth-ui (login/signup/password-reset/2FA forms). The /login
route already renders <LoginForm>; <ArcadiaProvider> in app/root.tsx reads
VITE_ARCADIA_URL (default localhost:4000) and VITE_ARCADIA_TENANT (default
"default").

CLAUDE.md and README rewritten to frame this as the admin app for
arcadia-core. docs/STARTER.md removed — arcadia-admin is a leaf consumer,
not a downstream starter.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/lib/llm-settings.ts

@@ -0,0 +1,99 @@
+// Persisted LLM settings — base URL, context budget, response cap.
+// Reactive across tabs (storage event) and within the same tab (custom event).
+
+import { useEffect, useSyncExternalStore } from "react"
+
+export type LLMSettings = {
+  baseURL: string
+  contextTokens: number
+  responseBudget: number
+  systemPrompt: string
+}
+
+export const DEFAULT_SYSTEM_PROMPT =
+  "You are a helpful general-purpose assistant embedded in an app. Handle any request the user makes — writing, brainstorming, code, analysis, casual chat — at the length the task deserves. Use markdown when it helps. You can also drive the UI when the user toggles UI Control on."
+
+export const DEFAULT_SETTINGS: LLMSettings = {
+  baseURL: "http://localhost:1234/v1",
+  contextTokens: 9000,
+  responseBudget: 512,
+  systemPrompt: DEFAULT_SYSTEM_PROMPT,
+}
+
+const STORAGE_KEY = "crema.llm.settings"
+const CHANGE_EVENT = "comfy:llm-settings-change"
+
+function readFromStorage(): LLMSettings {
+  if (typeof window === "undefined") return DEFAULT_SETTINGS
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY)
+    if (!raw) return DEFAULT_SETTINGS
+    const parsed = JSON.parse(raw) as Partial<LLMSettings>
+    return {
+      baseURL: typeof parsed.baseURL === "string" ? parsed.baseURL : DEFAULT_SETTINGS.baseURL,
+      contextTokens:
+        Number.isFinite(parsed.contextTokens) && (parsed.contextTokens as number) > 0
+          ? (parsed.contextTokens as number)
+          : DEFAULT_SETTINGS.contextTokens,
+      responseBudget:
+        Number.isFinite(parsed.responseBudget) && (parsed.responseBudget as number) > 0
+          ? (parsed.responseBudget as number)
+          : DEFAULT_SETTINGS.responseBudget,
+      systemPrompt:
+        typeof parsed.systemPrompt === "string" && parsed.systemPrompt.trim().length > 0
+          ? parsed.systemPrompt
+          : DEFAULT_SETTINGS.systemPrompt,
+    }
+  } catch {
+    return DEFAULT_SETTINGS
+  }
+}
+
+export function loadLLMSettings(): LLMSettings {
+  return readFromStorage()
+}
+
+export function saveLLMSettings(next: LLMSettings) {
+  if (typeof window === "undefined") return
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(next))
+  window.dispatchEvent(new CustomEvent(CHANGE_EVENT))
+}
+
+export function resetLLMSettings() {
+  saveLLMSettings(DEFAULT_SETTINGS)
+}
+
+let cached: LLMSettings | null = null
+
+function subscribe(cb: () => void): () => void {
+  const onChange = () => {
+    cached = null
+    cb()
+  }
+  window.addEventListener(CHANGE_EVENT, onChange)
+  window.addEventListener("storage", (e) => {
+    if (e.key === STORAGE_KEY) onChange()
+  })
+  return () => {
+    window.removeEventListener(CHANGE_EVENT, onChange)
+  }
+}
+
+function getSnapshot(): LLMSettings {
+  if (!cached) cached = readFromStorage()
+  return cached
+}
+
+function getServerSnapshot(): LLMSettings {
+  return DEFAULT_SETTINGS
+}
+
+export function useLLMSettings(): LLMSettings {
+  // useSyncExternalStore avoids hydration flicker and stays reactive.
+  const value = useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot)
+  // Re-read after mount to pick up localStorage on first client render.
+  useEffect(() => {
+    cached = null
+  }, [])
+  return value
+}