Add cookiebanner client

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/cookiebanner/errors.go

@@ -0,0 +1,26 @@
+// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package cookiebanner
+
+import "errors"
+
+var (
+	ErrBannerNotFound              = errors.New("cookie banner not found")
+	ErrCategoryNotFound            = errors.New("cookie category not found")
+	ErrBannerNotDraft              = errors.New("cookie banner is not in draft state")
+	ErrBannerAlreadyPublished      = errors.New("cookie banner is already published")
+	ErrBannerAlreadyDisabled       = errors.New("cookie banner is already disabled")
+	ErrCannotDeleteRequiredCategory = errors.New("cannot delete required cookie category")
+)