chore(webapp): tidy Slack support-channel release note and admin unlink

Collapse the release note back to a single entry, add a confirmation to the admin unlink action, and clarify the best-effort team-domain lookup.

Author: D-K-P

.server-changes/slack-support-channel-admin-downgrade.md

@@ -137,7 +137,7 @@ export default function Page() {
             </div>
           ) : supportChannel?.status === "PROVISIONING" ? (
             <Paragraph variant="small" className="text-text-dimmed">
-              Setting up your channel — check your email shortly for the Slack Connect invite.
+              Setting up your channel. Check your email shortly for the Slack Connect invite.
             </Paragraph>
           ) : (
             <Form method="post" className="flex flex-col gap-3">

.server-changes/slack-support-channel-unlink.md

@@ -357,7 +357,18 @@ function ChannelRow({
       </TableCell>
       <TableCell>
         {linkedInfo && (
-          <unlinkFetcher.Form method="post">
+          <unlinkFetcher.Form
+            method="post"
+            onSubmit={(e) => {
+              if (
+                !window.confirm(
+                  "Archive this Slack support channel and unlink it from the organization? The customer will lose access."
+                )
+              ) {
+                e.preventDefault();
+              }
+            }}
+          >
             <input type="hidden" name="organizationId" value={linkedInfo.organizationId} />
             <Button
               type="submit"

apps/webapp/app/routes/_app.orgs.$organizationSlug.settings.support.tsx

@@ -148,6 +148,8 @@ export class SupportSlackClientLive implements SupportSlackClient, SupportSlackD
       const res = await this.client.team.info({ team: teamId });
       return { domain: res.team?.domain, emailDomain: res.team?.email_domain };
     } catch {
+      // Best-effort enrichment only: cross-org team.info can fail, and the domain is
+      // just a matching hint. Fall back to no domains rather than failing discovery.
       return {};
     }
   }