cmms-embed: fix cmms-config validation rejecting the real server response

Browser-verified bug (2026-09-05, reported via the prod-side session):
/api/cmms-config now returns 200 with aiEnabled:true, but the widget still
never mounted. Root cause: isCmmsConfig() required entityType/entityId as
strict strings, but the actual response omits them entirely - the whole
payload failed validation and silently fell back to NO_WIDGET, with nothing
logged to say why.

Fix: only dark/aiEnabled/aiEditorKind actually gate anything - validate
just those, and default csrfToken/entityType/entityId to "" when absent
(they only feed the iframe's query string, harmless empty). Also added a
.catch() + console.error on the widget's own boot effect, so a future
mistake here logs instead of silently no-op'ing.

Verified against the exact captured response body
({"dark":true,"aiEnabled":true,"aiEditorKind":"kicad","csrfToken":"..."}):
now resolves aiEnabled:true. tsc --noEmit clean, vitest 469/469 passing.

Also investigated the separately-reported "Uncaught Error: undefined
self-hosted:8:1" console error: built the pre-patch source
(0146488) and the patched source with an identical toolchain/base and
diffed the eager main chunk - same file list, same
wasm/collab/index.ts dynamic/static-import warning, ~4KB size delta
matching only this patch's own new code. yjs/Y.Doc was ALREADY present
in the pre-patch eager main chunk (grepped the unpatched build output
directly), so this patch did not newly pull collab/yjs code into eager
load - whatever's throwing predates this patch's chunk composition. Not
provable further without a live browser (not available in this repo's
env, see CLAUDE.md) - not a fix, just contrary evidence to "this patch's
widget code caused it" for the prod-side session to browser-verify.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/standalone/src/components/CmmsAiWidget.tsx

@@ -20,18 +20,27 @@ export function CmmsAiWidget(): React.ReactElement | null {
 
   React.useEffect(() => {
     let cancelled = false;
-    fetchCmmsConfig().then((c) => {
-      if (cancelled) return;
-      setConfig(c);
-      if (c.aiEnabled) installAiBridge();
-      // Belt-and-braces alongside the `?theme=` hand-off (lib/theme.ts) — that
-      // param already wins whenever edit.php sets it, so this only matters if
-      // it's ever absent. Skip if the URL param already ran; setTheme is
-      // otherwise idempotent (persists + toggles the same `.dark` class).
-      if (c.dark && !new URLSearchParams(window.location.search).get("theme")) {
-        setTheme("dark");
-      }
-    });
+    // fetchCmmsConfig() never rejects (its own internal .catch() falls back
+    // to NO_WIDGET) — this .catch() guards the callback body itself instead
+    // (setConfig/installAiBridge/setTheme), so a mistake here becomes a
+    // logged no-op, not a silent unhandled rejection with nothing to say why
+    // the widget didn't appear.
+    fetchCmmsConfig()
+      .then((c) => {
+        if (cancelled) return;
+        setConfig(c);
+        if (c.aiEnabled) installAiBridge();
+        // Belt-and-braces alongside the `?theme=` hand-off (lib/theme.ts) —
+        // that param already wins whenever edit.php sets it, so this only
+        // matters if it's ever absent. Skip if the URL param already ran;
+        // setTheme is otherwise idempotent (persists + toggles `.dark`).
+        if (c.dark && !new URLSearchParams(window.location.search).get("theme")) {
+          setTheme("dark");
+        }
+      })
+      .catch((err: unknown) => {
+        console.error("[cmms-ai-widget] boot failed:", err);
+      });
     return () => {
       cancelled = true;
     };

web/standalone/src/lib/cmms-config.ts

@@ -15,17 +15,22 @@ export interface CmmsConfig {
   entityId: string;
 }
 
-function isCmmsConfig(v: unknown): v is CmmsConfig {
+// Only `dark` / `aiEnabled` / `aiEditorKind` actually gate behavior — a
+// bug found 2026-09-05 in browser verification required all six fields as
+// strict strings, so the real server response (which omits `entityType` /
+// `entityId`) failed validation and silently fell back to NO_WIDGET despite
+// `aiEnabled: true` — the widget never mounted and nothing logged why.
+// `csrfToken` / `entityType` / `entityId` are only used to build the iframe's
+// query string (harmless as `""`), so a missing one shouldn't disable the
+// widget entirely.
+function isCmmsConfigCore(v: unknown): v is Pick<CmmsConfig, "dark" | "aiEnabled" | "aiEditorKind"> {
   if (!v || typeof v !== "object") return false;
   const c = v as Record<string, unknown>;
-  return (
-    typeof c.dark === "boolean" &&
-    typeof c.aiEnabled === "boolean" &&
-    c.aiEditorKind === "kicad" &&
-    typeof c.csrfToken === "string" &&
-    typeof c.entityType === "string" &&
-    typeof c.entityId === "string"
-  );
+  return typeof c.dark === "boolean" && typeof c.aiEnabled === "boolean" && c.aiEditorKind === "kicad";
+}
+
+function optionalString(v: unknown): string {
+  return typeof v === "string" ? v : "";
 }
 
 const NO_WIDGET: CmmsConfig = {
@@ -47,7 +52,18 @@ export function fetchCmmsConfig(): Promise<CmmsConfig> {
   if (!cached) {
     cached = fetch(`${API_BASE_URL}/api/cmms-config`, { credentials: "include" })
       .then((r) => (r.ok ? r.json() : null))
-      .then((v) => (isCmmsConfig(v) ? v : NO_WIDGET))
+      .then((v): CmmsConfig => {
+        if (!isCmmsConfigCore(v)) return NO_WIDGET;
+        const c = v as Record<string, unknown>;
+        return {
+          dark: v.dark,
+          aiEnabled: v.aiEnabled,
+          aiEditorKind: v.aiEditorKind,
+          csrfToken: optionalString(c.csrfToken),
+          entityType: optionalString(c.entityType),
+          entityId: optionalString(c.entityId),
+        };
+      })
       .catch(() => NO_WIDGET);
   }
   return cached;