aesthetic-improvements: reduce decorative cyan backgrounds (80/20 rule)
- KodoEmptyState: decorative background blur and border (bg-kodo-cyan/20 → bg-kodo-steel/20, border-kodo-cyan/30 → border-kodo-steel/30, icon text-kodo-cyan → text-kodo-steel)
- PWAInstallBanner: decorative icon background and blur effect (2 instances)
- Page headers: SettingsPage, GearPage, DeveloperPage, SocialPage icon backgrounds (4 instances) - decorative header icons
- DashboardPage: activity item icon gradient background (decorative)
- FileManagerView: selection banner background (decorative)
- Total: ~8 files, ~9 instances replaced
- Preserved: Active/selected states (StudioView active tab, AccountSettings selected theme, SessionManagement current session), primary actions, informational alerts
- Action 11.3.1.3 in progress (first batch: decorative backgrounds)
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