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display_groups: wire proto decoder via decode_proto_or_text (#631)

* display_groups: wire proto decoder via decode_proto_or_text

DisplayGroupUpdated (msg 68) gates at PROTOBUF_REST_MESSAGES_3 (213).
The proto decoder existed but was unwired (#[allow(dead_code)]); the
text decoder used peek_string(3) directly. Post floor-213 bump, the
text path would silently return empty contract_info for every update
(peek_string is not proto-aware on the legacy index path).

Wires decode_display_group_updated through decode_proto_or_text so the
crate handles both wire formats correctly. The text branch will be
deleted after the floor-213 ratchet (PR-C5 in plans/floor-213-ratchet.md).

Prep step for plans/floor-213-ratchet.md.

* /simplify: use proto_response helper in test fixture

- Replace manual from_protobuf + encode dance with proto_response()
  helper (src/common/test_utils.rs:127); eliminates hardcoded server
  version literal
- Drop unused req_id field from the proto fixture (never asserted)

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