feat(tui): persist bottom panel preference across restarts

Save bottom_panel pref (logs/maint/none) to store on toggle.
Restore on startup via InitialModel, same pattern as detail_open.

internal/tui/data.go

@@ -50,6 +50,21 @@ func writeCmd(op string, fn func() error) tea.Cmd {
 	}
 }
 
+func (m *Model) saveBottomPanelPref() tea.Cmd {
+	v := "logs"
+	switch m.bottomPanel {
+	case bottomNone:
+		v = "none"
+	case bottomMaint:
+		v = "maint"
+	}
+	st := m.store
+	ctx := m.ctx
+	return writeCmd("Save bottom panel preference", func() error {
+		return st.SetPreference(ctx, "bottom_panel", v)
+	})
+}
+
 func sortSitesForDisplay(allSites []models.Site, collapsed map[int]bool, sortCol int, sortAsc bool) []models.Site {
 	var groups, ungrouped []models.Site
 	children := make(map[int][]models.Site)

internal/tui/tui.go

@@ -243,6 +243,16 @@ func InitialModel(ctx context.Context, isAdmin bool, s store.Store, eng *monitor
 
 	detailPref, _ := s.GetPreference(ctx, "detail_open")
 
+	bp := bottomLogs
+	if bpPref, _ := s.GetPreference(ctx, "bottom_panel"); bpPref != "" {
+		switch bpPref {
+		case "none":
+			bp = bottomNone
+		case "maint":
+			bp = bottomMaint
+		}
+	}
+
 	return Model{
 		ctx:          ctx,
 		state:        stateDashboard,
@@ -257,7 +267,7 @@ func InitialModel(ctx context.Context, isAdmin bool, s store.Store, eng *monitor
 		theme:        theme,
 		themeIndex:   themeIdx,
 		st:           newStyles(theme),
-		bottomPanel:  bottomLogs,
+		bottomPanel:  bp,
 		detailOpen:   detailPref == "true",
 		demoMode:     os.Getenv("UPTOP_DEMO") == "1",
 		version:      version,

internal/tui/update.go

@@ -662,6 +662,7 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.focusedPanel = panelMaint
 		}
 		m.recalcLayout()
+		return m, m.saveBottomPanelPref()
 	case "l":
 		if m.bottomPanel == bottomLogs {
 			m.bottomPanel = bottomNone
@@ -671,6 +672,7 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.focusedPanel = panelLogs
 		}
 		m.recalcLayout()
+		return m, m.saveBottomPanelPref()
 	case "up", "k":
 		if m.focusedPanel == panelDetail && m.detailOpen {
 			m.detailScrollOffset--