Zone page: links to the same zone in the other views

The header says "also in VIEW" for every zone of the same name in
another view, linked or not, in the view's colour, keeping the open tab
where the other zone has it. The zone API gains in_views.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/api/types.go

@@ -34,6 +34,9 @@ type Zone struct {
 	LinkedWith []string `json:"linked_with,omitempty"`
 	// Links are the zones this one is linked with, with their views.
 	Links []ZoneLink `json:"links,omitempty"`
+	// InViews are the zones of this name in the other views (any type),
+	// in view order: for going straight to one.
+	InViews []ZoneLink `json:"in_views,omitempty"`
 	// OtherViews are the other views with a primary zone of this name
 	// (linked or not): what GET /zones/{zone}/compare compares.
 	OtherViews []string `json:"other_views,omitempty"`
@@ -628,6 +631,9 @@ type BlockRule struct {
 type ZoneLink struct {
 	ID   int64  `json:"id"`
 	View string `json:"view"`
+	// Type and Linked are set in Zone.InViews.
+	Type   string `json:"type,omitempty"`
+	Linked bool   `json:"linked,omitempty"`
 }
 
 // EncDNSSummary is what the dashboard says about encrypted DNS.