feat: redesign TUI + Ctrl+C quit confirm + version logic + sudo handling

- Replace 'q' quit with Ctrl+C confirmation dialog (Yes/No overlay)
  Second Ctrl+C within 2s force quits
- Redesign TUI with Charm bubbles components: spinner, progress bar,
  help bar, key bindings, better color palette, rounded borders
- Add Shift+Tab to cycle tabs backward
- Fix version: bump to 0.2.0, release workflow checks existing tags
  before publishing (no more overwriting releases)
- Handle sudo: CLI auto-relaunches with sudo/pkexec for tools that
  need elevated privileges, TUI shows clear error message

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

go.mod

@@ -15,6 +15,7 @@ require (
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
 	github.com/catppuccin/go v0.3.0 // indirect
 	github.com/charmbracelet/colorprofile v0.4.1 // indirect
+	github.com/charmbracelet/harmonica v0.2.0 // indirect
 	github.com/charmbracelet/x/ansi v0.11.6 // indirect
 	github.com/charmbracelet/x/cellbuf v0.0.15 // indirect
 	github.com/charmbracelet/x/exp/strings v0.0.0-20240722160745-212f7b056ed0 // indirect