fix(macos-bar): correct set-default key, lead account, asset name

Send the composite provider:accountId (row.id) for Set as default so the server
can resolve the CLIProxy account; feature the account closest to exhaustion
(lowest remaining quota) in the title instead of the healthiest; rename the
packaged asset to CCS-Bar.app.zip to match what 'ccs bar install' downloads.

macos-bar/Scripts/package_app.sh

@@ -54,10 +54,10 @@ case "$SIGNING" in
     ;;
 esac
 
-ZIP="$DIST/CCS-Bar.zip"
+ZIP="$DIST/CCS-Bar.app.zip"
 echo "[i] Zipping -> $ZIP"
 rm -f "$ZIP"
-( cd "$DIST" && ditto -c -k --keepParent "$APP_NAME.app" "CCS-Bar.zip" )
+( cd "$DIST" && ditto -c -k --keepParent "$APP_NAME.app" "CCS-Bar.app.zip" )
 
 echo "[OK] Packaged: $APP"
 echo "[OK] Asset:    $ZIP"

macos-bar/Sources/CCSBarApp/BarViewModel.swift

@@ -83,7 +83,10 @@ final class BarViewModel: ObservableObject {
     perform { try await $0.solo(provider: row.provider, accountId: row.accountId) }
   }
   func setDefault(_ row: BarSummaryRow) {
-    perform { try await $0.setDefault(name: row.accountId) }
+    // The server's /api/accounts/default parses CLIProxy accounts as the
+    // composite "provider:accountId" key; row.id already has that shape.
+    // Sending the bare accountId fails parseCliproxyKey and 500s / no-ops.
+    perform { try await $0.setDefault(name: row.id) }
   }
   func tierLock(_ row: BarSummaryRow, tier: String?) {
     perform { try await $0.tierLock(provider: row.provider, tier: tier) }

macos-bar/Sources/CCSBarCheck/main.swift

@@ -127,6 +127,16 @@ do {
   check(title.contains("$3.20"), "title shows total cost")
 }
 
+// leadRow features the account CLOSEST TO EXHAUSTION (lowest remaining %),
+// not the healthiest. quota_percentage is REMAINING quota.
+let twoActive = [
+  BarSummaryRow(accountId: "a", provider: "agy", quotaPercentage: 90, health: "ok"),
+  BarSummaryRow(accountId: "b", provider: "agy", quotaPercentage: 30, health: "ok"),
+]
+let twoTitle = BarFormatting.statusTitle(rows: twoActive)
+check(twoTitle.contains("30%"), "title features lowest-remaining (closest to exhaustion)")
+check(!twoTitle.contains("90%"), "title does not feature the healthiest account")
+
 // MARK: RefreshDebouncer (arms at decision time)
 
 var deb = RefreshDebouncer(interval: 15)

macos-bar/Sources/CCSBarCore/BarFormatting.swift

@@ -30,12 +30,16 @@ public enum BarFormatting {
     return parts.joined(separator: " \u{00B7} ")
   }
 
-  /// The row to surface in the compact title: the one closest to exhaustion
-  /// (highest quota used). Rows without a known percentage sort last.
+  /// The row to surface in the compact title: the one closest to exhaustion.
+  /// `quota_percentage` is REMAINING quota (higher = more left), so the lead is
+  /// the LOWEST remaining percentage. Rows without a known percentage are not
+  /// chosen unless no row has one.
   static func leadRow(_ rows: [BarSummaryRow]) -> BarSummaryRow? {
-    rows.max { lhs, rhs in
-      (lhs.quotaPercentage ?? -1) < (rhs.quotaPercentage ?? -1)
+    let withPct = rows.filter { $0.quotaPercentage != nil }
+    if let lead = withPct.min(by: { ($0.quotaPercentage ?? 0) < ($1.quotaPercentage ?? 0) }) {
+      return lead
     }
+    return rows.first
   }
 }