fix(skattekonto): stop conflating live-call auth failures with "inte anslutet" + surface SKV connection first in tax settings (#887)

The sync endpoint returns 401 for six distinct auth states (handleSkvError):
NOT_CONNECTED, SESSION_EXPIRED, REFRESH_EXHAUSTED, MISSING_SCOPE,
TOKEN_CORRUPTED, TOKEN_REVOKED. The page treated every 401 as "Skatteverket
är inte anslutet" — directly contradicting Inställningar, which reads the
stored token metadata and truthfully shows "Ansluten" for all but the first.

- syncNow now checks the structured error code: only NOT_CONNECTED flips to
  the not-connected empty state. Every other auth failure renders the
  server's actual Swedish message as a persistent banner with an "Anslut
  igen" CTA, keeping the stored saldo/transactions visible.
- SkatteverketConnectPanel moves to the top of /settings/tax — the
  skattekonto and momsdeklaration pages send users there specifically to
  (re)connect, and below the tax form it sat out of view.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

components/settings/sections/TaxSettingsContent.tsx

@@ -77,11 +77,14 @@ export function TaxSettingsContent() {
 
   return (
     <div className="space-y-8">
+      {/* Connection panel first: the skattekonto and momsdeklaration pages
+          send users here specifically to (re)connect — below the long tax
+          form it sat out of view. */}
+      {showSkatteverket && <SkatteverketConnectPanel />}
+
       <SettingsFormWrapper onSave={handleSave} className="space-y-0">
         <TaxSettingsForm settings={settings} />
       </SettingsFormWrapper>
-
-      {showSkatteverket && <SkatteverketConnectPanel />}
     </div>
   )
 }