Connection dialog: tidy the AWS lookup warning

Seen while checking the Connections image work (Task 6668) in Edit/Add connection › Advanced. Suggestions: 1. The AWS lookup warning glues AWS's sentence to "Auto still works." with no separator ("…provided access credentials Auto still works."). Add the missing period/space so it reads as two sentences. 2. The warning sits between Security group and Root volume, pushing the volume field down while the actual problem is the credential. Place it directly under the Credential field it concerns. 3. Show the pinned image's age and the re-pin flag next to the Image (AMI id) field when editing a pinned connection, matching the Connections table. Out of scope: how images or networks are resolved at launch or save (apps/api/app/cloud_node_launch.py, apps/api/app/cloud_connection_network.py). Done means: - The warning reads as two sentences and sits under the Credential field. - Editing a pinned connection shows its pin age and flags one past the re-pin.

The lookup warning now sits under Credential as two sentences, and editing a pinned connection shows its pin age with the re-pin flag, sharing the table's connectionImage (Task 6668). PR #5615 merged, and its Jaah Deploy succeeded. The full gate's only failures were unrelated load flakes. Visual check done at 1280 and 390px. Draft follow-up: Task 6709.