fix(nodes): per-category client email lists behind the node count chips

NodeView carried only the category counts, so the nodes page chips
could hover to nothing but the category title. GetAll/recountByGuid
now emit online/active/disabled/depleted email lists from the same
bucketing pass as the counts (statuses gain the client email;
the online list is the counted set), and the chips pop the list
over with the inbounds page's popover pattern.

internal/database/model/model.go

@@ -847,6 +847,15 @@ type Node struct {
 	DisabledCount int `json:"disabledCount" gorm:"-" example:"3"`
 	DepletedCount int `json:"depletedCount" gorm:"-" example:"1"`
 
+	// Per-category client email lists backing the counts above, filled by
+	// the node read paths (GetAll / recountByGuid) from the same bucketing
+	// so the nodes page can show WHO is in each category on hover, not just
+	// how many. Read-time only, never persisted.
+	OnlineEmails   []string `json:"-" gorm:"-"`
+	ActiveEmails   []string `json:"-" gorm:"-"`
+	DisabledEmails []string `json:"-" gorm:"-"`
+	DepletedEmails []string `json:"-" gorm:"-"`
+
 	// ParentGuid + Transitive are set only when a node is surfaced as part of a
 	// node tree (#4983): direct nodes carry the master panel's own GUID, a
 	// transitive sub-node carries its parent node's GUID. Transitive nodes are