Fix stream paused scrolling and apply pending TUI/probe updates

10 files changed, 435 insertions, 17 deletions

diff --git a/internal/tui/dashboard/model.go b/internal/tui/dashboard/model.go
index 8b2c814..9b425b1 100644
--- a/internal/tui/dashboard/model.go
+++ b/internal/tui/dashboard/model.go
@@ -73,6 +73,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case tea.WindowSizeMsg:
 		m.width = msg.Width
 		m.height = msg.Height
+		m.streamModel.SetViewport(msg.Width, msg.Height)
 		return m, nil
 	case refreshTickMsg:
 		snap := m.snapshot()
@@ -104,7 +105,10 @@ func (m Model) handleKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 	prevActiveTab := m.activeTab
 	var cmd tea.Cmd
 	keyStr := msg.String()
-	handled := m.handleArrowTabKey(keyStr) || m.handleScrollKey(keyStr)
+	handled := m.handleArrowTabKey(keyStr) || m.handleScrollKey(msg)
+	if handled && m.activeTab == TabStream && (keyStr == " " || keyStr == "space") && !m.streamModel.Paused() {
+		cmd = streamTickCmd()
+	}
 
 	if !handled {
 		switch {
@@ -171,7 +175,8 @@ func (m *Model) handleArrowTabKey(keyStr string) bool {
 	}
 }
 
-func (m *Model) handleScrollKey(keyStr string) bool {
+func (m *Model) handleScrollKey(msg tea.KeyMsg) bool {
+	keyStr := msg.String()
 	switch m.activeTab {
 	case TabSyscalls:
 		return scrollOffset(keyStr, &m.syscallsOffset, m.maxSyscallsRows())
@@ -183,7 +188,9 @@ func (m *Model) handleScrollKey(keyStr string) bool {
 	case TabProcesses:
 		return scrollOffset(keyStr, &m.processesOffset, m.maxProcessesRows())
 	case TabStream:
-		return m.streamModel.HandleKey(keyStr)
+		streamWidth, streamHeight := common.EffectiveViewport(m.width, m.height)
+		m.streamModel.SetViewport(streamWidth, streamHeight)
+		return m.streamModel.HandleTeaKey(msg)
 	default:
 		return false
 	}
diff --git a/internal/tui/dashboard/model_test.go b/internal/tui/dashboard/model_test.go
index c1b2e1d..1e54b27 100644
--- a/internal/tui/dashboard/model_test.go
+++ b/internal/tui/dashboard/model_test.go
@@ -1,11 +1,15 @@
 package dashboard
 
 import (
+	"fmt"
+	"regexp"
+	"strconv"
 	"strings"
 	"testing"
 
 	"ior/internal/statsengine"
 	common "ior/internal/tui/common"
+	"ior/internal/tui/eventstream"
 	"ior/internal/tui/messages"
 
 	tea "github.com/charmbracelet/bubbletea"
@@ -161,6 +165,87 @@ func TestFilesTabGroupedScrollUsesDirectoryOffset(t *testing.T) {
 	}
 }
 
+func TestStreamSpaceUnpauseSchedulesStreamTick(t *testing.T) {
+	rb := eventstream.NewRingBuffer()
+	m := NewModelWithConfig(nil, rb, 250, common.DefaultKeyMap())
+	m.activeTab = TabStream
+	m.streamModel.HandleKey("space") // pause
+
+	next, cmd := m.Update(tea.KeyMsg{Type: tea.KeySpace})
+	_ = next
+	if cmd == nil {
+		t.Fatalf("expected stream tick command when unpausing stream")
+	}
+}
+
+func TestStreamPausedSupportsJKArrowsAndPageKeys(t *testing.T) {
+	rb := eventstream.NewRingBuffer()
+	for i := 0; i < 300; i++ {
+		rb.Push(eventstream.StreamEvent{
+			Seq:      uint64(i + 1),
+			Syscall:  "read",
+			Comm:     "proc",
+			PID:      1000,
+			TID:      uint32(2000 + i),
+			FileName: fmt.Sprintf("/tmp/file-%03d", i),
+		})
+	}
+
+	m := NewModelWithConfig(nil, rb, 250, common.DefaultKeyMap())
+	m.activeTab = TabStream
+	next, _ := m.Update(tea.WindowSizeMsg{Width: 120, Height: 30})
+	m = next.(Model)
+
+	m.streamModel.Refresh()
+	_ = m.View()
+
+	next, _ = m.Update(tea.KeyMsg{Type: tea.KeySpace}) // pause
+	m = next.(Model)
+	before := rowFromStreamView(t, m.View())
+
+	next, _ = m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'k'}})
+	m = next.(Model)
+	afterK := rowFromStreamView(t, m.View())
+	if afterK >= before {
+		t.Fatalf("expected k to scroll up while paused: before=%d afterK=%d", before, afterK)
+	}
+
+	next, _ = m.Update(tea.KeyMsg{Type: tea.KeyDown})
+	m = next.(Model)
+	afterDown := rowFromStreamView(t, m.View())
+	if afterDown <= afterK {
+		t.Fatalf("expected down arrow to scroll down while paused: afterK=%d afterDown=%d", afterK, afterDown)
+	}
+
+	next, _ = m.Update(tea.KeyMsg{Type: tea.KeyPgUp})
+	m = next.(Model)
+	afterPgUp := rowFromStreamView(t, m.View())
+	if afterPgUp >= afterDown {
+		t.Fatalf("expected pgup to scroll up while paused: afterDown=%d afterPgUp=%d", afterDown, afterPgUp)
+	}
+
+	next, _ = m.Update(tea.KeyMsg{Type: tea.KeyPgDown})
+	m = next.(Model)
+	afterPgDown := rowFromStreamView(t, m.View())
+	if afterPgDown <= afterPgUp {
+		t.Fatalf("expected pgdown to scroll down while paused: afterPgUp=%d afterPgDown=%d", afterPgUp, afterPgDown)
+	}
+}
+
+func rowFromStreamView(t *testing.T, view string) int {
+	t.Helper()
+	re := regexp.MustCompile(`Row ([0-9]+)/([0-9]+)`)
+	m := re.FindStringSubmatch(view)
+	if len(m) != 3 {
+		t.Fatalf("stream row status not found in view")
+	}
+	row, err := strconv.Atoi(m[1])
+	if err != nil {
+		t.Fatalf("invalid row value %q: %v", m[1], err)
+	}
+	return row
+}
+
 func TestDirGroupKeyTogglesOnlyOnFilesTab(t *testing.T) {
 	m := NewModelWithConfig(nil, nil, 250, common.DefaultKeyMap())
 	m.activeTab = TabFiles
diff --git a/internal/tui/eventstream/model.go b/internal/tui/eventstream/model.go
index f51b7b5..0c50d0c 100644
--- a/internal/tui/eventstream/model.go
+++ b/internal/tui/eventstream/model.go
@@ -36,6 +36,17 @@ func NewModel(source *RingBuffer) Model {
 	}
 }
 
+// SetViewport updates the render/scroll viewport dimensions used for
+// max-scroll and page-step calculations during key handling.
+func (m *Model) SetViewport(width, height int) {
+	if width > 0 {
+		m.width = width
+	}
+	if height > 0 {
+		m.height = height
+	}
+}
+
 // SetSource updates the backing ring buffer and refreshes visible rows.
 func (m *Model) SetSource(source *RingBuffer) {
 	m.source = source
@@ -47,6 +58,11 @@ func (m Model) FilterModalVisible() bool {
 	return m.filterModal.Visible()
 }
 
+// Paused reports whether stream refresh is currently paused.
+func (m Model) Paused() bool {
+	return m.paused
+}
+
 func (m *Model) HandleKey(keyStr string) bool {
 	if m.filterModal.Visible() {
 		wasVisible := m.filterModal.Visible()
@@ -66,10 +82,12 @@ func (m *Model) HandleKey(keyStr string) bool {
 	case " ", "space":
 		m.paused = !m.paused
 		if !m.paused {
+			// Resuming should return to live-tail behavior immediately.
+			m.autoScroll = true
 			m.Refresh()
 		}
 		return true
-	case "f":
+	case "f", "F":
 		m.pauseBeforeFilter = m.paused
 		m.paused = true
 		m.filterModal = m.filterModal.Open(m.filter)
@@ -87,24 +105,44 @@ func (m *Model) HandleKey(keyStr string) bool {
 		m.applyFilter()
 		return true
 	case "j", "down":
-		if m.scrollOffset < m.maxScrollOffset() {
-			m.scrollOffset++
-		}
-		if m.scrollOffset < m.maxScrollOffset() {
-			m.autoScroll = false
-		}
+		m.scrollByLines(1)
 		return true
 	case "k", "up":
-		if m.scrollOffset > 0 {
-			m.scrollOffset--
-		}
-		m.autoScroll = false
+		m.scrollByLines(-1)
+		return true
+	case "pgdown", "pgdn", "pagedown":
+		m.scrollByLines(m.pageStep())
+		return true
+	case "pgup", "pageup":
+		m.scrollByLines(-m.pageStep())
 		return true
 	default:
 		return false
 	}
 }
 
+// HandleTeaKey handles stream keys based on Bubble Tea key message types first,
+// then falls back to string matching for rune-driven shortcuts.
+func (m *Model) HandleTeaKey(msg tea.KeyMsg) bool {
+	switch msg.Type {
+	case tea.KeyUp:
+		return m.HandleKey("up")
+	case tea.KeyDown:
+		return m.HandleKey("down")
+	case tea.KeyPgUp:
+		return m.HandleKey("pgup")
+	case tea.KeyPgDown:
+		return m.HandleKey("pgdown")
+	case tea.KeySpace:
+		return m.HandleKey("space")
+	case tea.KeyRunes:
+		if len(msg.Runes) == 1 {
+			return m.HandleKey(string(msg.Runes[0]))
+		}
+	}
+	return m.HandleKey(msg.String())
+}
+
 func (m *Model) View(width, height int) string {
 	if width <= 0 {
 		width = 100
@@ -198,6 +236,34 @@ func (m *Model) visibleRows() int {
 	return rows
 }
 
+func (m *Model) pageStep() int {
+	rows := m.visibleRows()
+	if rows <= 1 {
+		return 1
+	}
+	return rows - 1
+}
+
+func (m *Model) scrollByLines(delta int) {
+	if delta == 0 {
+		return
+	}
+	max := m.maxScrollOffset()
+	next := m.scrollOffset + delta
+	if next < 0 {
+		next = 0
+	}
+	if next > max {
+		next = max
+	}
+	if next != m.scrollOffset {
+		m.scrollOffset = next
+	}
+	if m.scrollOffset < max {
+		m.autoScroll = false
+	}
+}
+
 func keyMsgFromString(keyStr string) tea.KeyMsg {
 	switch keyStr {
 	case "esc":
diff --git a/internal/tui/eventstream/model_test.go b/internal/tui/eventstream/model_test.go
index 937bb33..bfcbca7 100644
--- a/internal/tui/eventstream/model_test.go
+++ b/internal/tui/eventstream/model_test.go
@@ -62,6 +62,76 @@ func TestModelScrollClamp(t *testing.T) {
 	}
 }
 
+func TestModelPageScrollWithPgUpPgDown(t *testing.T) {
+	rb := NewRingBuffer()
+	m := NewModel(rb)
+	m.height = 12 // visibleRows=4, pageStep=3
+	pushEvents(rb, 30)
+	m.Refresh()
+	m.HandleKey("g")
+
+	if !m.HandleKey("pgdown") {
+		t.Fatalf("pgdown should be handled")
+	}
+	if m.scrollOffset != 3 {
+		t.Fatalf("expected page down to move by 3, got %d", m.scrollOffset)
+	}
+
+	if !m.HandleKey("pagedown") {
+		t.Fatalf("pagedown should be handled")
+	}
+	if m.scrollOffset != 6 {
+		t.Fatalf("expected pagedown alias to move by 3, got %d", m.scrollOffset)
+	}
+
+	if !m.HandleKey("pgup") {
+		t.Fatalf("pgup should be handled")
+	}
+	if m.scrollOffset != 3 {
+		t.Fatalf("expected page up to move up by 3, got %d", m.scrollOffset)
+	}
+	if !m.HandleKey("pageup") {
+		t.Fatalf("pageup should be handled")
+	}
+	if m.scrollOffset != 0 {
+		t.Fatalf("expected pageup alias to return to top, got %d", m.scrollOffset)
+	}
+}
+
+func TestModelArrowAndJKScroll(t *testing.T) {
+	rb := NewRingBuffer()
+	m := NewModel(rb)
+	m.height = 12
+	pushEvents(rb, 30)
+	m.Refresh()
+	m.HandleKey("g")
+
+	if !m.HandleKey("down") {
+		t.Fatalf("down should be handled")
+	}
+	if m.scrollOffset != 1 {
+		t.Fatalf("expected down to increment offset, got %d", m.scrollOffset)
+	}
+	if !m.HandleKey("j") {
+		t.Fatalf("j should be handled")
+	}
+	if m.scrollOffset != 2 {
+		t.Fatalf("expected j to increment offset, got %d", m.scrollOffset)
+	}
+	if !m.HandleKey("up") {
+		t.Fatalf("up should be handled")
+	}
+	if m.scrollOffset != 1 {
+		t.Fatalf("expected up to decrement offset, got %d", m.scrollOffset)
+	}
+	if !m.HandleKey("k") {
+		t.Fatalf("k should be handled")
+	}
+	if m.scrollOffset != 0 {
+		t.Fatalf("expected k to decrement offset, got %d", m.scrollOffset)
+	}
+}
+
 func TestModelFilterReducesVisibleRows(t *testing.T) {
 	rb := NewRingBuffer()
 	m := NewModel(rb)
@@ -170,3 +240,70 @@ func TestFilterModalTemporarilyPausesAndRestoresState(t *testing.T) {
 		t.Fatalf("expected paused state preserved after modal close")
 	}
 }
+
+func TestUnpauseRestoresLiveTailAndRefresh(t *testing.T) {
+	rb := NewRingBuffer()
+	m := NewModel(rb)
+	m.height = 10
+	pushEvents(rb, 20)
+	m.Refresh()
+
+	// Move off tail, then pause.
+	m.HandleKey("g")
+	if m.autoScroll {
+		t.Fatalf("expected autoScroll disabled at top")
+	}
+	m.HandleKey("space")
+	if !m.paused {
+		t.Fatalf("expected paused")
+	}
+
+	// New events arrive while paused.
+	pushEvents(rb, 5)
+	m.Refresh()
+
+	// Resume: should auto-tail and refresh immediately.
+	m.HandleKey("space")
+	if m.paused {
+		t.Fatalf("expected unpaused")
+	}
+	if !m.autoScroll {
+		t.Fatalf("expected autoScroll restored on resume")
+	}
+	if m.scrollOffset != m.maxScrollOffset() {
+		t.Fatalf("expected tail offset after resume, got offset=%d max=%d", m.scrollOffset, m.maxScrollOffset())
+	}
+}
+
+func TestPausedScrollWithJKAndPageKeys(t *testing.T) {
+	rb := NewRingBuffer()
+	m := NewModel(rb)
+	m.height = 20
+	pushEvents(rb, 100)
+	m.Refresh()
+	if !m.HandleKey("space") {
+		t.Fatalf("space should toggle pause")
+	}
+	before := rowNumber(m.scrollOffset, len(m.filtered))
+	if !m.HandleKey("k") {
+		t.Fatalf("k should be handled while paused")
+	}
+	afterK := rowNumber(m.scrollOffset, len(m.filtered))
+	if afterK >= before {
+		t.Fatalf("expected k to scroll up while paused: before=%d after=%d", before, afterK)
+	}
+	if !m.HandleKey("pgup") {
+		t.Fatalf("pgup should be handled while paused")
+	}
+	afterPgUp := rowNumber(m.scrollOffset, len(m.filtered))
+	if afterPgUp >= afterK {
+		t.Fatalf("expected pgup to scroll up while paused: afterK=%d afterPgUp=%d", afterK, afterPgUp)
+	}
+	if !m.HandleKey("pgdown") {
+		t.Fatalf("pgdown should be handled while paused")
+	}
+	afterPgDown := rowNumber(m.scrollOffset, len(m.filtered))
+	if afterPgDown <= afterPgUp {
+		t.Fatalf("expected pgdown to scroll down while paused: afterPgUp=%d afterPgDown=%d", afterPgUp, afterPgDown)
+	}
+}
diff --git a/internal/tui/eventstream/render.go b/internal/tui/eventstream/render.go
index e1781f8..24864b9 100644
--- a/internal/tui/eventstream/render.go
+++ b/internal/tui/eventstream/render.go
@@ -32,7 +32,7 @@ func RenderStreamTable(width int, paused bool, totalCount, filteredCount, buffer
 		lines = append(lines, renderEventRow(ev, contentWidth))
 	}
 
-	return common.PanelStyle.Width(width).Render(strings.Join(lines, "\n"))
+	return common.PanelStyle.Width(contentWidth).Render(strings.Join(lines, "\n"))
 }
 
 func renderStatusLine(paused bool, totalCount, filteredCount, bufferLen, bufferCap int) string {
diff --git a/internal/tui/eventstream/render_test.go b/internal/tui/eventstream/render_test.go
index c7f32cd..65d7a61 100644
--- a/internal/tui/eventstream/render_test.go
+++ b/internal/tui/eventstream/render_test.go
@@ -3,6 +3,8 @@ package eventstream
 import (
 	"strings"
 	"testing"
+
+	"github.com/charmbracelet/lipgloss"
 )
 
 func TestRenderStatusAndFilterLines(t *testing.T) {
@@ -100,3 +102,25 @@ func TestComputeColumnLayoutGivesFileMoreSpace(t *testing.T) {
 		t.Fatalf("expected file column to get most width, got %d", cols.file)
 	}
 }
+
+func TestRenderStreamTableFitsRequestedWidth(t *testing.T) {
+	out := RenderStreamTable(80, false, 1, 1, 1, 10000, Filter{}, []StreamEvent{
+		{
+			Syscall:    "read",
+			Comm:       "worker",
+			PID:        1,
+			TID:        2,
+			DurationNs: 2000,
+			GapNs:      100,
+			Bytes:      64,
+			FileName:   "/very/long/path/that/should/be/truncated/for/narrow/views/file.log",
+			RetVal:     1,
+		},
+	})
+
+	for _, line := range strings.Split(out, "\n") {
+		if lipgloss.Width(line) > 80 {
+			t.Fatalf("line exceeds width 80: %d %q", lipgloss.Width(line), line)
+		}
+	}
+}
diff --git a/internal/tui/probes/model.go b/internal/tui/probes/model.go
index dffa30f..5cec2c7 100644
--- a/internal/tui/probes/model.go
+++ b/internal/tui/probes/model.go
@@ -117,9 +117,9 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 			}
 			return m, toggleCmd(m.manager, selected)
 		case "a":
-			return m, bulkToggleCmd(m.manager, m.filtered(), false)
+			return m, bulkToggleCmd(m.manager, m.probes, false)
 		case "n":
-			return m, bulkToggleCmd(m.manager, m.filtered(), true)
+			return m, bulkToggleCmd(m.manager, m.probes, true)
 		}
 	}
 	return m, nil
diff --git a/internal/tui/probes/model_test.go b/internal/tui/probes/model_test.go
index 74f6a6b..73a83bc 100644
--- a/internal/tui/probes/model_test.go
+++ b/internal/tui/probes/model_test.go
@@ -78,3 +78,44 @@ func TestToggleEmitsProbeToggledMsg(t *testing.T) {
 	}
 	_ = next
 }
+
+func TestBulkKeysApplyGloballyNotOnlyFiltered(t *testing.T) {
+	fm := &fakeManager{
+		states: []probemanager.ProbeState{
+			{Syscall: "read", Active: true},
+			{Syscall: "write", Active: true},
+			{Syscall: "openat", Active: true},
+		},
+	}
+	m := NewModel(fm).Open()
+	m.search = "read"
+
+	_, cmd := m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'n'}})
+	if cmd == nil {
+		t.Fatalf("expected bulk off command")
+	}
+	msg := cmd()
+	if toggled, ok := msg.(ProbeToggledMsg); !ok || toggled.Err != nil {
+		t.Fatalf("unexpected bulk off msg: %#v", msg)
+	}
+	if len(fm.toggles) != 3 {
+		t.Fatalf("expected all probes toggled off despite filter, got toggles=%+v", fm.toggles)
+	}
+
+	// Re-open with all inactive and filtered search still present; "a" should
+	// toggle all probes back on.
+	m = NewModel(fm).Open()
+	m.search = "read"
+	fm.toggles = nil
+	_, cmd = m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'a'}})
+	if cmd == nil {
+		t.Fatalf("expected bulk on command")
+	}
+	msg = cmd()
+	if toggled, ok := msg.(ProbeToggledMsg); !ok || toggled.Err != nil {
+		t.Fatalf("unexpected bulk on msg: %#v", msg)
+	}
+	if len(fm.toggles) != 3 {
+		t.Fatalf("expected all probes toggled on despite filter, got toggles=%+v", fm.toggles)
+	}
+}
diff --git a/internal/tui/tui.go b/internal/tui/tui.go
index 5dba75c..5a8c14b 100644
--- a/internal/tui/tui.go
+++ b/internal/tui/tui.go
@@ -12,6 +12,7 @@ import (
 	dashboardui "ior/internal/tui/dashboard"
 	"ior/internal/tui/eventstream"
 	tuiexport "ior/internal/tui/export"
+	"ior/internal/tui/messages"
 	"ior/internal/tui/pidpicker"
 	"ior/internal/tui/probes"
 	"os"
@@ -104,6 +105,21 @@ func getProbeManager() ProbeManager {
 	return probeManagerState.manager
 }
 
+func resetDashboardSnapshotSource() *statsengine.Snapshot {
+	src := getDashboardSnapshotSource()
+	if src == nil {
+		return nil
+	}
+	if resettable, ok := src.(interface {
+		Reset()
+		Snapshot() *statsengine.Snapshot
+	}); ok {
+		resettable.Reset()
+		return resettable.Snapshot()
+	}
+	return nil
+}
+
 // Run starts the TUI program in alternate screen mode.
 func Run() error {
 	return RunWithTraceStarter(defaultTraceStarter)
@@ -233,6 +249,11 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case probes.ProbeToggledMsg:
 		var cmd tea.Cmd
 		m.probeModal, cmd = m.probeModal.Update(msg)
+		if snap := resetDashboardSnapshotSource(); snap != nil {
+			next, dashboardCmd := m.dashboard.Update(messages.StatsTickMsg{Snap: snap})
+			m.dashboard = next.(dashboardui.Model)
+			return m, tea.Batch(dashboardCmd, cmd)
+		}
 		return m, cmd
 	case PidSelectedMsg:
 		return m.handlePidSelected(msg)
diff --git a/internal/tui/tui_test.go b/internal/tui/tui_test.go
index 0f55b40..31a2e94 100644
--- a/internal/tui/tui_test.go
+++ b/internal/tui/tui_test.go
@@ -15,6 +15,7 @@ import (
 	"time"
 
 	"ior/internal/flags"
+	"ior/internal/tui/probes"
 
 	"github.com/charmbracelet/bubbles/key"
 	tea "github.com/charmbracelet/bubbletea"
@@ -186,6 +187,20 @@ func (f fakeDashboardSource) Snapshot() *statsengine.Snapshot {
 	return f.snap
 }
 
+type fakeResettableDashboardSource struct {
+	snap       *statsengine.Snapshot
+	resetCalls int
+}
+
+func (f *fakeResettableDashboardSource) Snapshot() *statsengine.Snapshot {
+	return f.snap
+}
+
+func (f *fakeResettableDashboardSource) Reset() {
+	f.resetCalls++
+	f.snap = &statsengine.Snapshot{TotalSyscalls: 0}
+}
+
 func TestDashboardRefreshPicksLateBoundSource(t *testing.T) {
 	orig := getDashboardSnapshotSource()
 	defer SetDashboardSnapshotSource(orig)
@@ -202,6 +217,28 @@ func TestDashboardRefreshPicksLateBoundSource(t *testing.T) {
 	}
 }
 
+func TestProbeToggledMsgResetsDashboardStatsSource(t *testing.T) {
+	src := &fakeResettableDashboardSource{snap: &statsengine.Snapshot{TotalSyscalls: 99}}
+	SetDashboardSnapshotSource(src)
+	t.Cleanup(func() { SetDashboardSnapshotSource(nil) })
+
+	m := NewModel(-1, func(context.Context) error { return nil })
+	m.screen = ScreenDashboard
+	m.attaching = false
+	m.probeModal = probes.NewModel(fakeProbeManager{states: []probemanager.ProbeState{{Syscall: "read", Active: true}}}).Open()
+
+	next, _ := m.Update(probes.ProbeToggledMsg{Syscall: "read"})
+	updated := next.(Model)
+
+	if src.resetCalls != 1 {
+		t.Fatalf("expected one reset call, got %d", src.resetCalls)
+	}
+	snap := updated.dashboard.LatestSnapshot()
+	if snap == nil || snap.TotalSyscalls != 0 {
+		t.Fatalf("expected dashboard snapshot refreshed from reset source, got %+v", snap)
+	}
+}
+
 func TestTracingStartedRebindsEventStreamSource(t *testing.T) {
 	orig := getEventStreamSource()
 	defer SetEventStreamSource(orig)