fix(agent): hide Anthropic-only assistant surfaces where the provider cannot run them (#2204) (#2343)

* fix(agent): hide Anthropic-only assistant surfaces where the provider cannot run them

Self-hosted deployments on an OpenAI-compatible provider (or with no AI
configured) still showed every entry point into the tool-loop runtime
behind /api/agent/invoke, which answers 503 there. The capability lived
server-side only (getAiStatus().assistantAvailable); no UI could read it.

Hand the flag to the client through CompanyContext (useAssistantAvailable,
beside the paid-capability gate) and gate each entry point that opens
AgentChat: the bookkeeping page's "Skapa med assistent" and "Med
assistenten", the inbox workspace's "Fråga assistenten" doors, /chat/intake
and /chat/new?intent=. The floating trigger falls back to general help (the
single-call console runs on any provider) instead of hiding, and AgentChat
itself never fires an invoke without the runtime, so a resumed thread or a
forgotten entry point shows a notice instead of a 503. The Hem checklist's
"Anslut till Claude" step renders only where the assistant runs on Claude
and the mcp-server extension is on. Provider-agnostic AI (ask console,
categorization, extraction) and the server-side 503 are unchanged; on
hosted the flag is true and nothing changes.

Closes #2204

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019SaJfqNi4VmsG8FMKq99G6

* test(ai): use a placeholder that cannot match an Anthropic key shape

The new direct-Anthropic status test assigned a string in the exact
format of a live API key, which trips secret scanners on every run. The
config only reads presence, so any non-empty string exercises the path.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

---------

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

components/extensions/general/InvoiceInboxWorkspace.tsx

@@ -61,7 +61,7 @@ import { useReceiptHunt } from '@/components/extensions/general/use-receipt-hunt
 import { createClient } from '@/lib/supabase/client'
 import { fetchWithTimeout } from '@/lib/http/fetch-with-timeout'
 import { copyInboxAddress, type AddressCopyState } from '@/components/extensions/general/inbox-address-copy'
-import { useCapability, useCompanyOptional } from '@/contexts/CompanyContext'
+import { useAssistantAvailable, useCapability, useCompanyOptional } from '@/contexts/CompanyContext'
 import { CAPABILITY } from '@/lib/entitlements/keys'
 import { useBranding } from '@/lib/branding/brand-context'
 import type { WorkspaceComponentProps } from '@/lib/extensions/workspace-registry'
@@ -440,6 +440,9 @@ export default function InvoiceInboxWorkspace(_props: WorkspaceComponentProps) {
   // Its own input: sharing the header's would upload without the purchase.
   const purchaseFileInputRef = useRef<HTMLInputElement | null>(null)
   const { openAgentSheet, identity } = useAgentSheet()
+  // Both "Fråga assistenten" doors below open the tool-loop runtime
+  // (/api/agent/invoke); hide them where the deployment cannot run it (#2204).
+  const assistantAvailable = useAssistantAvailable()
 
   const [items, setItems] = useState<InboxItem[]>([])
   const [isLoading, setIsLoading] = useState(true)
@@ -1869,7 +1872,7 @@ export default function InvoiceInboxWorkspace(_props: WorkspaceComponentProps) {
               </Button>
               {/* Secondary actions: outlined, so they read as buttons */}
               <div className="flex items-center gap-2">
-                {identity.isVerified && (
+                {identity.isVerified && assistantAvailable && (
                   <Button
                     variant="outline"
                     size="sm"
@@ -2197,7 +2200,7 @@ export default function InvoiceInboxWorkspace(_props: WorkspaceComponentProps) {
                 await Promise.all([fetchItems(), handleSelect(targetId)])
               }}
               onAskAssistant={
-                identity.isVerified
+                identity.isVerified && assistantAvailable
                   ? (transactionId) => {
                       openAgentSheet({
                         intentId: 'transaction.categorization',