Hide stacks, clearer errors & validator

• Hide stacks from the list: tuck away folders like “lost+found” with one tap, restore anytime
• Clearer errors: dismissible banners with Retry and Reconnect actions
• Archive is easier to find: explained empty state and an always-visible filter
• Create stack: “Deploy” and “Save Draft” are now clear buttons
• compose.yaml validator with syntax checking right in the editor
• A hint about Dockge-Enhanced for matching servers
• Better accessibility: Dynamic Type and VoiceOver labels
• Connection kept dropping — now stable
• Stopped stacks show a disclosure arrow again
• Filter bar no longer jumps; the active filter is never lost
• “Down” now asks for confirmation
• More reliable splash screen and onboarding