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/recipe/recipe.go

@@ -32,6 +32,10 @@
 //   - launch                  start the recipe's app
 //   - foreground 30s          wait until the recipe's app is in front
 //   - wait   "Search" 30s     wait for an element whose text matches
+//   - wait   id:search_box 30s  wait for an element by resource id. The short
+//     name after the "/" is enough. Use this when a
+//     label rotates (the Maps search box does); it is
+//     still a named match, never a coordinate (FR-4).
 //   - wait   exact "Pause" 60s retry 3
 //     if it never appears, re-run the step above and
 //     wait again (a busy phone can drop a tap)