fix(tui): track selection by site ID + q means back everywhere

Cursor tracked by site ID instead of positional index. When the
list re-sorts every tick (sites change status), the selection stays
on the same monitor instead of silently jumping to whatever now
occupies that index position.

q now means "back" in detail, history, SLA, and alert-detail views
— consistent with muscle memory from navigating deeper views.
Only the dashboard q quits the app. ctrl+c always quits from
anywhere.

internal/tui/data.go

@@ -105,9 +105,24 @@ func (m *Model) refreshLive() {
 	}
 	m.sites = ordered
 	m.logViewport.SetContent(strings.Join(m.engine.GetLogs(), "\n"))
+
+	if m.currentTab == 0 && m.selectedID != 0 {
+		for i, s := range m.sites {
+			if s.ID == m.selectedID {
+				m.cursor = i
+				break
+			}
+		}
+	}
 	m.clampCursor()
 }
 
+func (m *Model) syncSelectedID() {
+	if m.currentTab == 0 && m.cursor < len(m.sites) {
+		m.selectedID = m.sites[m.cursor].ID
+	}
+}
+
 // clampCursor keeps the cursor and scroll offset within the current tab's list.
 func (m *Model) clampCursor() {
 	listLen := m.currentListLen()

internal/tui/tab_alerts.go

@@ -271,7 +271,7 @@ func (m Model) viewAlertDetailPanel() string {
 	}
 
 	b.WriteString(m.divider() + "\n")
-	b.WriteString(m.st.subtleStyle.Render("  [i/Esc] Back  [e] Edit  [t] Test  [q] Quit"))
+	b.WriteString(m.st.subtleStyle.Render("  [q/Esc] Back  [e] Edit  [t] Test"))
 
 	return lipgloss.NewStyle().Padding(1, 2).Render(b.String())
 }

internal/tui/tui.go

@@ -103,6 +103,7 @@ type Model struct {
 	state        sessionState
 	currentTab   int
 	cursor       int
+	selectedID   int
 	tableOffset  int
 	maxTableRows int
 	termWidth    int

internal/tui/update.go

@@ -286,6 +286,7 @@ func (m *Model) handleMouse(msg tea.MouseMsg) (tea.Model, tea.Cmd) {
 			}
 		}
 	}
+	m.syncSelectedID()
 	return m, nil
 }
 
@@ -379,7 +380,7 @@ func (m *Model) handleDetailKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			return m, m.openSLAView(m.sites[m.cursor])
 		}
 	case "q":
-		return m, tea.Quit
+		m.state = stateDashboard
 	}
 	return m, nil
 }
@@ -499,10 +500,8 @@ func (m *Model) handleHistoryKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 
 func (m *Model) handleAlertDetailKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 	switch msg.String() {
-	case "i", "esc":
+	case "q", "i", "esc":
 		m.state = stateDashboard
-	case "q":
-		return m, tea.Quit
 	}
 	return m, nil
 }
@@ -537,6 +536,7 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			if m.cursor < m.tableOffset {
 				m.tableOffset = m.cursor
 			}
+			m.syncSelectedID()
 		}
 	case "down", "j":
 		if m.state == stateLogs {
@@ -548,6 +548,7 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 				if m.cursor >= m.tableOffset+m.maxTableRows {
 					m.tableOffset++
 				}
+				m.syncSelectedID()
 			}
 		}
 	case "n":

internal/tui/view_detail.go

@@ -254,7 +254,7 @@ func (m Model) viewDetailPanel() string {
 
 	b.WriteString("\n")
 	b.WriteString(m.divider() + "\n")
-	b.WriteString(m.st.subtleStyle.Render("  [i/Esc] Back  [e] Edit  [h] History  [s] SLA  [click] Inspect  [q] Quit"))
+	b.WriteString(m.st.subtleStyle.Render("  [q/Esc] Back  [e] Edit  [h] History  [s] SLA  [click] Inspect"))
 
 	return lipgloss.NewStyle().Padding(1, 2).Render(b.String())
 }