feat: enable PSD2 bank integration via settings

- Uncomment Enable Banking extension in loader (now registered at runtime)
- Add subscriptionNotice field to ExtensionDefinition type
- Show confirmation dialog when enabling extensions with subscription requirements
- Fix Settings banking tab: toggle-aware visibility, URL-addressable tabs,
  BankSelector widget, correct API paths (/api/extensions/ext/enable-banking/*)
- Replace inline bank connection cards with BankConnectionStatus component
- Add actionable link to Settings from EnableBankingWorkspace
- Update CLAUDE.md with latest architecture docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

components/extensions/ExtensionToggleButton.tsx

@@ -1,23 +1,71 @@
 'use client'
 
+import { useState } from 'react'
 import { Switch } from '@/components/ui/switch'
+import { Button } from '@/components/ui/button'
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog'
 import { useExtensionToggle } from '@/lib/extensions/hooks'
 
 export default function ExtensionToggleButton({
   sectorSlug,
   extensionSlug,
+  subscriptionNotice,
 }: {
   sectorSlug: string
   extensionSlug: string
+  subscriptionNotice?: string
 }) {
   const { enabled, isLoading, toggle } = useExtensionToggle(sectorSlug, extensionSlug)
+  const [showConfirm, setShowConfirm] = useState(false)
+
+  function handleToggle() {
+    // Show confirmation dialog when enabling an extension with a subscription notice
+    if (!enabled && subscriptionNotice) {
+      setShowConfirm(true)
+      return
+    }
+    toggle()
+  }
+
+  function handleConfirm() {
+    setShowConfirm(false)
+    toggle()
+  }
 
   return (
-    <Switch
-      checked={enabled}
-      onCheckedChange={toggle}
-      disabled={isLoading}
-      aria-label={enabled ? 'Inaktivera tillägg' : 'Aktivera tillägg'}
-    />
+    <>
+      <Switch
+        checked={enabled}
+        onCheckedChange={handleToggle}
+        disabled={isLoading}
+        aria-label={enabled ? 'Inaktivera tillägg' : 'Aktivera tillägg'}
+      />
+
+      {subscriptionNotice && (
+        <Dialog open={showConfirm} onOpenChange={setShowConfirm}>
+          <DialogContent>
+            <DialogHeader>
+              <DialogTitle>Extern prenumeration krävs</DialogTitle>
+              <DialogDescription>{subscriptionNotice}</DialogDescription>
+            </DialogHeader>
+            <DialogFooter>
+              <Button variant="outline" onClick={() => setShowConfirm(false)}>
+                Avbryt
+              </Button>
+              <Button onClick={handleConfirm}>
+                Jag förstår, aktivera
+              </Button>
+            </DialogFooter>
+          </DialogContent>
+        </Dialog>
+      )}
+    </>
   )
 }