tui: revamp footer (some more)

Simplified layout logic, reorganized elements

pkg/tui/model/model.go

@@ -26,6 +26,7 @@ type AppModel struct {
 	Model         string
 	ProviderName  string
 	Provider      provider.ChatCompletionProvider
+	Agent		  *lmcli.Agent
 }
 
 func NewAppModel(ctx *lmcli.Context, initialConversation *api.Conversation) *AppModel {
@@ -42,6 +43,7 @@ func NewAppModel(ctx *lmcli.Context, initialConversation *api.Conversation) *App
 	model, provider, _, _ := ctx.GetModelProvider(*ctx.Config.Defaults.Model, "")
 	app.Model = model
 	app.ProviderName = provider
+	app.Agent = ctx.GetAgent(ctx.Config.Defaults.Agent)
 	return app
 }
 
@@ -264,9 +266,8 @@ func (a *AppModel) Prompt(
 		Temperature: *a.Ctx.Config.Defaults.Temperature,
 	}
 
-	agent := a.Ctx.GetAgent(a.Ctx.Config.Defaults.Agent)
-	if agent != nil {
-		params.Toolbox = agent.Toolbox
+	if a.Agent != nil {
+		params.Toolbox = a.Agent.Toolbox
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())