Rework the CONNECTIONS section

- Label each connection with its tailnet and account rather than the
  nickname alone. `tailscale switch --list --json` carries both, and on a
  multi-tailnet setup the nickname is the least useful field — "andre"
  says nothing about which tailnet you would be switching to. Renders as
  "headscale.pertento.ai (andre)", falling back through tailnet, then
  account, then profile id when a field is missing.

- Mark the active connection with colour instead of a filled background:
  brand yellow on its label, currentFill cleared. The theme sets
  selected-border-width to 0, so clearing the fill leaves nothing drawn.
  Hover still highlights through `fill`, so the row keeps its affordance.
  Exit-node and Mullvad-region rows are untouched and still fill.

- Sort the active connection to the top. Done in parseAccounts rather
  than at render time: the keyboard cursor indexes into
  tailscale.accounts, so sorting only in the view would leave j/k acting
  on a different row than the highlighted one. Array.sort is stable, so
  the remaining profiles keep the CLI's order.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Model.js

@@ -57,11 +57,25 @@ function osIcon(os) {
   return "󰟀"
 }
 
+// Stock returned the nickname alone, which on a multi-tailnet setup is the
+// least useful field — "andre" and "pastilhas" say nothing about which tailnet
+// you would be switching to. `tailscale switch --list --json` carries both, so
+// show the tailnet with the account in parentheses:
+//
+//   headscale.pertento.ai (andre)
+//   offscale.pastilhas.dev (pastilhas)
+//
+// Falls back through the same chain as before when a field is absent, so a
+// profile with no tailnet still renders something meaningful.
 function accountLabel(account) {
   if (!account) return "Unknown account"
-  if (account.nickname) return String(account.nickname)
-  if (account.tailnet) return String(account.tailnet)
-  if (account.account) return String(account.account)
+
+  var tailnet = String(account.tailnet || "").trim()
+  var who = String(account.account || account.nickname || "").trim()
+
+  if (tailnet !== "" && who !== "") return tailnet + " (" + who + ")"
+  if (tailnet !== "") return tailnet
+  if (who !== "") return who
   return String(account.id || "Unknown account")
 }
 
@@ -292,6 +306,19 @@ function parseAccounts(raw) {
         if (account.selected === true) selected = account
       }
     }
+
+    // Active connection first, everything else in the order the CLI listed it.
+    // Sorted here rather than in the view so the Repeater and the keyboard
+    // cursor (accountIndex) index into the same ordering — sorting only at
+    // render time would leave j/k selecting a different row than the one
+    // highlighted. Array.sort is stable, so the unselected profiles keep their
+    // relative order.
+    next.sort(function(left, right) {
+      var l = left.selected === true ? 0 : 1
+      var r = right.selected === true ? 0 : 1
+      return l - r
+    })
+
     return {
       accounts: next,
       selectedAccountId: selected ? String(selected.id || "") : "",