fix(FN-XXX): unify codex auth and chat fallback

packages/dashboard/app/components/OAuthManualCodeForm.tsx

@@ -0,0 +1,51 @@
+import "./OAuthManualCodeForm.css";
+
+interface OAuthManualCodeFormProps {
+  value: string;
+  onChange: (value: string) => void;
+  onSubmit: () => void;
+  prompt: string;
+  placeholder?: string;
+  helpText?: string;
+  disabled?: boolean;
+  submitLabel?: string;
+  "data-testid"?: string;
+}
+
+export function OAuthManualCodeForm({
+  value,
+  onChange,
+  onSubmit,
+  prompt,
+  placeholder,
+  helpText,
+  disabled = false,
+  submitLabel = "Submit code",
+  "data-testid": testId,
+}: OAuthManualCodeFormProps) {
+  return (
+    <div className="oauth-manual-code" data-testid={testId}>
+      <p className="oauth-manual-code__prompt">{prompt}</p>
+      <textarea
+        className="form-input oauth-manual-code__input"
+        value={value}
+        onChange={(event) => onChange(event.target.value)}
+        placeholder={placeholder}
+        rows={3}
+        spellCheck={false}
+        disabled={disabled}
+      />
+      <div className="oauth-manual-code__actions">
+        <button
+          type="button"
+          className="btn btn-sm"
+          onClick={onSubmit}
+          disabled={disabled}
+        >
+          {submitLabel}
+        </button>
+      </div>
+      {helpText && <p className="oauth-manual-code__help">{helpText}</p>}
+    </div>
+  );
+}