fix: render ugreen_logo correctly using template mode on green bg

The ugreen_logo.png is a black outline on transparent background.
Rendering it as .template (white) over UGREEN brand green (#1FA462)
makes it visible and on-brand on all three screens:
- LoginView: 90pt logo below kisani. wordmark
- ConnectView: 72pt logo replaces old Kisani title
- BackupView toolbar: 22pt chip with matching treatment

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Features/Backup/BackupView.swift

@@ -81,11 +81,17 @@ struct BackupView: View {
 
     private var logoChip: some View {
         HStack(spacing: 6) {
-            Image("ugreen_logo")
-                .resizable()
-                .scaledToFit()
-                .frame(width: 22, height: 22)
-                .clipShape(RoundedRectangle(cornerRadius: 5, style: .continuous))
+            ZStack {
+                RoundedRectangle(cornerRadius: 6, style: .continuous)
+                    .fill(Color(red: 0.12, green: 0.64, blue: 0.38))
+                    .frame(width: 22, height: 22)
+                Image("ugreen_logo")
+                    .resizable()
+                    .renderingMode(.template)
+                    .scaledToFit()
+                    .frame(width: 15, height: 15)
+                    .foregroundStyle(.white)
+            }
             Text("kisani.")
                 .font(.system(size: 13, weight: .medium, design: .monospaced))
                 .foregroundStyle(AppTheme.inkSecondary)