feat: use bubbletea framework

- implement TUI in bubbletea
  - split components into separate files
- remove now unused functions
- restructure files

cmd/client/keys.go

@@ -0,0 +1,44 @@
+package client
+
+import "github.com/charmbracelet/bubbles/key"
+
+// keyMap defines a set of keybindings. To work for help it must satisfy
+// key.Map. It could also very easily be a map[string]key.Binding.
+type keyMap struct {
+	Start key.Binding
+	Stop  key.Binding
+	Reset key.Binding
+	Quit  key.Binding
+}
+
+var keys = keyMap{
+	Start: key.NewBinding(
+		key.WithKeys(" "),
+		key.WithHelp("space", "start/pause/resume"),
+	),
+	Stop: key.NewBinding(
+		key.WithKeys("s"),
+		key.WithHelp("s", "stop"),
+	),
+	Reset: key.NewBinding(
+		key.WithKeys("r"),
+		key.WithHelp("r", "reset"),
+	),
+	Quit: key.NewBinding(
+		key.WithKeys("q"),
+		key.WithHelp("q", "quit"),
+	),
+}
+
+func (k keyMap) ShortHelp() []key.Binding {
+	return []key.Binding{
+		keys.Start,
+		keys.Stop,
+		keys.Reset,
+		keys.Quit,
+	}
+}
+
+func (k keyMap) FullHelp() [][]key.Binding {
+	return [][]key.Binding{}
+}