fix: address the Maps search box by id, and re-prove Phase 5

The Maps omnibox hint rotates: it read "Search here" in the Phase 5 run and
"Try petrol stations, ATMs" in the AUD-128 re-verification, so the recipe's
text match on it failed. The resource id does not rotate.

- internal/ui: add Find/FindID and the "id:" selector; Find dispatches an
  id: selector to the resource id and everything else to text as before.
- internal/recipe: wait/tap/wait_gone/tap_if and the tap helper use Find, so a
  recipe may name a resource id. Guards stay text-only.
- recipes/maps_navigate.recipe: wait/tap id:search_omnibox_text_box.
- tests for the id selector; docs and README updated.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

internal/ui/dump.go

@@ -103,16 +103,56 @@ func shortID(id string) string {
 	return id
 }
 
+// IDSelector marks a selector that matches a resource id rather than text. A
+// step that names "id:search_omnibox_text_box" finds the element with that
+// resource id, whatever its visible label happens to be.
+//
+// This exists because some labels are not stable: the Google Maps search box
+// carries a rotating hint as its content description ("Search here", "Try
+// petrol stations, ATMs", ...), so a recipe that matched that text broke when
+// the phone picked a different hint. The resource id does not rotate.
+const IDSelector = "id:"
+
 // FindText returns nodes whose text or content description matches query.
 // When exact is false the match is case-insensitive and substring-based.
 func (h *Hierarchy) FindText(query string, exact bool) []*Node {
+	return h.find(query, exact, false)
+}
+
+// FindID returns nodes whose resource id matches query. When exact is false the
+// match is case-insensitive and substring-based, so the short name
+// "search_omnibox_text_box" matches the full
+// "com.google.android.apps.maps:id/search_omnibox_text_box".
+func (h *Hierarchy) FindID(query string, exact bool) []*Node {
+	return h.find(query, exact, true)
+}
+
+// Find returns nodes matching a recipe selector. A selector that starts with
+// "id:" is matched against the resource id; any other selector is matched
+// against text and content description (FR-4).
+func (h *Hierarchy) Find(query string, exact bool) []*Node {
+	if id, ok := strings.CutPrefix(query, IDSelector); ok {
+		return h.FindID(id, exact)
+	}
+	return h.FindText(query, exact)
+}
+
+func (h *Hierarchy) find(query string, exact, byID bool) []*Node {
 	if query == "" {
 		return nil
 	}
 	needle := strings.ToLower(query)
 	var out []*Node
 	h.Walk(func(n *Node) {
-		for _, candidate := range []string{n.Text, n.ContentDesc} {
+		var candidates []string
+		if byID {
+			if n.ResourceID != "" {
+				candidates = []string{shortID(n.ResourceID), n.ResourceID}
+			}
+		} else {
+			candidates = []string{n.Text, n.ContentDesc}
+		}
+		for _, candidate := range candidates {
 			if candidate == "" {
 				continue
 			}