fix(tui): rework lists and search dialog

packages/tui/internal/completions/provider.go

@@ -0,0 +1,8 @@
+package completions
+
+// CompletionProvider defines the interface for completion data providers
+type CompletionProvider interface {
+	GetId() string
+	GetChildEntries(query string) ([]CompletionSuggestion, error)
+	GetEmptyMessage() string
+}