fix(teams): say "game server", not "shard", on the never-synced Teams panel

Admin → Teams told an operator that an unsynced projection "is not a
confirmed empty shard". Teams is a core primitive and core's word for the
host is the game server; "shard" is Ultima Online's. The detail now reads
"What is shown below does not confirm that the game server has no Teams."

The matching test, and the four comments that said "shard" about the same
state, follow it. Found while making runicgateway.com's core docs
game-neutral (runicgateway.com#34), which had to paraphrase this line
rather than quote it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

client/test/teamActivity.test.js

@@ -19,7 +19,7 @@ test('a deployment with no provider is not stale, it is uninvolved', () => {
   assert.equal(freshnessNote({ configured: false }, NOW), null)
 })
 
-test('never synced is a warning, and never reads as a confirmed empty shard', () => {
+test('never synced is a warning, and never reads as a confirmed empty roster', () => {
   const note = freshnessNote({ configured: true, lastSyncAt: null }, NOW)
   assert.equal(note.tone, 'warn')
   assert.match(note.text, /Not yet confirmed/)