More monior TUI refactor/cleanup

`tui/tui.go` is no longer responsible for passing window resize updates
to all views, instead we request a new window size message to be sent at
the same time we enter the view, allowing the view to catch and handle
it.

Add `Initialized` to `tui/shared/View` model, now we only call
`Init` on a view before entering it for the first time, rather than
calling `Init` on all views when the application starts.

Renames file, small cleanups

pkg/tui/tui.go

@@ -24,12 +24,12 @@ type LaunchOptions struct {
 }
 
 type Model struct {
-	App           *model.AppModel
-	view          shared.View
+	App  *model.AppModel
+	view shared.View
+
+	// views
 	chat          chat.Model
 	conversations conversations.Model
-	Width         int
-	Height        int
 }
 
 func initialModel(ctx *lmcli.Context, opts LaunchOptions) Model {
@@ -50,8 +50,6 @@ func initialModel(ctx *lmcli.Context, opts LaunchOptions) Model {
 
 func (m Model) Init() tea.Cmd {
 	return tea.Batch(
-		m.conversations.Init(),
-		m.chat.Init(),
 		func() tea.Msg {
 			return shared.MsgViewChange(m.view)
 		},
@@ -96,15 +94,23 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		}
 	case shared.MsgViewChange:
 		m.view = shared.View(msg)
+
+		var cmds []tea.Cmd
 		switch m.view {
-		case shared.StateChat:
-			m.chat.HandleResize(m.Width, m.Height)
 		case shared.StateConversations:
-			m.conversations.HandleResize(m.Width, m.Height)
+			if !m.conversations.Initialized {
+				cmds = append(cmds, m.conversations.Init())
+				m.conversations.Initialized = true
+			}
+		case shared.StateChat:
+			if !m.chat.Initialized {
+				cmds = append(cmds, m.chat.Init())
+				m.chat.Initialized = true
+			}
 		}
-		return m, func() tea.Msg { return shared.MsgViewEnter(struct{}{}) }
-	case tea.WindowSizeMsg:
-		m.Width, m.Height = msg.Width, msg.Height
+		cmds = append(cmds, tea.WindowSize(), shared.ViewEnter())
+
+		return m, tea.Batch(cmds...)
 	}
 
 	var cmd tea.Cmd