feat(tui-go): global input history + stop idle redraws (copy-safe)

Input history is now a single global ring (recordInput) shared by every input surface —
free-chat, the workflow-intent line, and in-session chat — so ↑/↓ recalls anything you've
sent, including outside a session (previously per-session, so idle/intent had none).

Copy fix: the 120ms animation tick now only runs while something actually animates
(animating(): active session spinner, blinking caret, reconnect). Init no longer starts it
unconditionally; tickKick (re)starts it on demand and tickMsg stops it when idle. An idle
screen no longer auto-redraws, so a native terminal text selection survives instead of being
wiped every frame. Tests cover the ring (dedup/cap/cross-context walk) and the idle gate.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/tui-go/internal/app/input_history_test.go

@@ -0,0 +1,91 @@
+package app
+
+import "testing"
+
+// History is a single global ring shared by every input surface (free-chat, the
+// workflow-intent line, in-session chat), so ↑/↓ recalls anything you've sent — including
+// outside a session, which the per-session map could not do.
+func TestRecordInputGlobalRing(t *testing.T) {
+	m := NewModel(nil)
+
+	m.recordInput("first")
+	m.recordInput("  second  ") // trimmed
+	m.recordInput("second")     // immediate dup ignored
+	m.recordInput("")           // blank ignored
+	m.recordInput("   ")        // blank-after-trim ignored
+
+	want := []string{"first", "second"}
+	if len(m.inputHistory) != len(want) {
+		t.Fatalf("inputHistory = %q, want %q", m.inputHistory, want)
+	}
+	for i := range want {
+		if m.inputHistory[i] != want[i] {
+			t.Fatalf("inputHistory[%d] = %q, want %q", i, m.inputHistory[i], want[i])
+		}
+	}
+}
+
+func TestRecordInputCaps(t *testing.T) {
+	m := NewModel(nil)
+	for i := 0; i < 250; i++ {
+		m.recordInput(string(rune('a'+i%26)) + itoa(i))
+	}
+	if len(m.inputHistory) != 100 {
+		t.Fatalf("ring len = %d, want 100 (capped)", len(m.inputHistory))
+	}
+}
+
+// (itoa is defined in view.go and reused here for the cap test.)
+
+// ↑/↓ walks the ring with no session selected (selectedID == ""), proving history
+// recall works in free-chat / intent contexts, not just in-session.
+func TestHistoryWalkWithoutSession(t *testing.T) {
+	m := NewModel(nil)
+	m.recordInput("one")
+	m.recordInput("two")
+	m.inputBuffer = "draft"
+
+	m.historyPrev() // newest first
+	if m.inputBuffer != "two" {
+		t.Fatalf("prev#1 = %q, want %q", m.inputBuffer, "two")
+	}
+	m.historyPrev()
+	if m.inputBuffer != "one" {
+		t.Fatalf("prev#2 = %q, want %q", m.inputBuffer, "one")
+	}
+	m.historyPrev() // clamp at oldest
+	if m.inputBuffer != "one" {
+		t.Fatalf("prev#3 (clamp) = %q, want %q", m.inputBuffer, "one")
+	}
+	m.historyNext()
+	if m.inputBuffer != "two" {
+		t.Fatalf("next#1 = %q, want %q", m.inputBuffer, "two")
+	}
+	m.historyNext() // back to the stashed live draft
+	if m.inputBuffer != "draft" {
+		t.Fatalf("next#2 = %q, want restored draft %q", m.inputBuffer, "draft")
+	}
+}
+
+// (animating + caps tests below.)
+
+// animating() gates the redraw tick: it must be FALSE on an idle screen (normal mode,
+// no active session) so terminal selection survives, and TRUE while typing or spinning.
+func TestAnimatingGatesIdleRedraw(t *testing.T) {
+	m := NewModel(nil)
+	m.editMode = ModeNormal
+	if m.animating() {
+		t.Fatal("idle (normal mode, no active session) must NOT animate — else selection is wiped")
+	}
+
+	m.editMode = ModeInsert
+	if !m.animating() {
+		t.Fatal("insert mode must animate (blinking caret)")
+	}
+	m.editMode = ModeNormal
+
+	m.sessions = []Session{{ID: "s1", Active: true}}
+	if !m.animating() {
+		t.Fatal("an active session must animate (spinner)")
+	}
+}

apps/tui-go/internal/app/model.go

@@ -228,9 +228,9 @@ type Model struct {
 	inputMode    InputMode
 	inputBuffer  string
 	inputCursor  int
-	history      map[string][]string
-	historyIndex int
-	savedBuffer  string
+	inputHistory []string // submitted lines across all contexts (chat, intent, in-session), newest last
+	historyIndex int      // -1 = editing the live buffer; else an index into inputHistory
+	savedBuffer  string   // live buffer stashed while walking history
 
 	// flow flags
 	sessionEntered       bool
@@ -303,6 +303,9 @@ type Model struct {
 
 	// animation
 	frame   int  // tick counter; drives spinner + caret blink
+	ticking bool // true while a tick loop is scheduled. The loop is gated on animating()
+	// so an idle screen stops redrawing — which lets native terminal selection survive
+	// (the 120ms redraw used to wipe a mouse drag every frame).
 
 	// snapshot phase
 	snapshotPhase bool
@@ -338,7 +341,6 @@ func NewModel(client *ws.Client) Model {
 		theme:           NewTheme(SoftBlue),
 		wfIndex:         -1,
 		inputMode:       ModeRouter,
-		history:         map[string][]string{},
 		historyIndex:    -1,
 		routerMessages:  map[string][]RouterEntry{},
 		configStaged:    map[string]string{},

apps/tui-go/internal/app/update.go

@@ -27,9 +27,45 @@ func tick() tea.Cmd {
 	return tea.Tick(120*time.Millisecond, func(time.Time) tea.Msg { return tickMsg{} })
 }
 
-// Init starts the channel readers and the cursor-blink tick.
+// Init starts the channel readers. The animation tick is NOT started here — it is
+// kicked lazily by tickKick once something actually needs to animate (an active
+// session's spinner, a blinking caret), so an idle screen never auto-redraws.
 func (m Model) Init() tea.Cmd {
-	return tea.Batch(readServer(m.client), readConn(m.client), tick())
+	return tea.Batch(readServer(m.client), readConn(m.client))
+}
+
+// animating reports whether anything on screen needs the frame counter to advance:
+// a spinning session, a blinking caret (any typing surface), or the reconnect state.
+// When false, the tick loop stops and the screen holds still — so a native terminal
+// text selection survives instead of being wiped by the next redraw.
+func (m Model) animating() bool {
+	if m.editMode == ModeInsert || m.steering || m.clarTyping || m.proposeTyping || m.configEditing {
+		return true
+	}
+	if m.reconnecting {
+		return true
+	}
+	if m.overlay == OverlayPalette { // the palette shows a blinking filter caret
+		return true
+	}
+	for i := range m.sessions {
+		if m.sessions[i].Active {
+			return true
+		}
+	}
+	return false
+}
+
+// tickKick starts the tick loop iff animation is needed and no loop is already
+// running. Returns nil otherwise. The single-loop invariant: ticking is true exactly
+// while a loop is scheduled (set here, cleared by tickMsg when it stops), so this
+// never spawns a second concurrent loop.
+func (m *Model) tickKick() tea.Cmd {
+	if m.animating() && !m.ticking {
+		m.ticking = true
+		return tick()
+	}
+	return nil
 }
 
 // Update is the single reducer. View renders purely from the returned model.
@@ -41,15 +77,19 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 	case tickMsg:
 		m.frame++
+		if m.animating() {
 			return m, tick()
+		}
+		m.ticking = false // loop stops; tickKick will restart it when animation resumes
+		return m, nil
 
 	case connMsg:
 		m.applyConn(msg.s)
-		return m, readConn(m.client)
+		return m, tea.Batch(readConn(m.client), m.tickKick())
 
 	case serverMsg:
 		m.applyServerPhased(msg.m)
-		return m, readServer(m.client)
+		return m, tea.Batch(readServer(m.client), m.tickKick())
 
 	case sessionsLoadedMsg:
 		m.applySessionsLoaded(msg)
@@ -62,7 +102,13 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		return m, nil
 
 	case tea.KeyMsg:
-		return m.handleKey(msg)
+		next, cmd := m.handleKey(msg)
+		// A keypress may have entered a typing/active state (insert mode, steering, …);
+		// kick the tick so the caret/spinner animates again.
+		if nm, ok := next.(Model); ok {
+			return nm, tea.Batch(cmd, nm.tickKick())
+		}
+		return next, cmd
 	}
 	return m, nil
 }
@@ -757,6 +803,7 @@ func (m Model) submit() (tea.Model, tea.Cmd) {
 		// Intent line for a workflow being started.
 		if m.wfPendingID != "" {
 			id := m.wfPendingID
+			m.recordInput(text)
 			m.client.Send(protocol.StartSession(id, text))
 			m.wfPendingID = ""
 			m.wfPendingName = ""
@@ -788,6 +835,7 @@ func (m Model) submit() (tea.Model, tea.Cmd) {
 		s.Name = "chat"
 		m.selectedID = id
 		m.sessionEntered = true
+		m.recordInput(text)
 		m.client.Send(protocol.StartChatSession(id, text))
 		m.clearInput()
 		return m, nil
@@ -797,12 +845,7 @@ func (m Model) submit() (tea.Model, tea.Cmd) {
 			return m, nil
 		}
 		sid := m.selectedID
-		hist := m.history[sid]
-		hist = append(hist, text)
-		if len(hist) > 50 {
-			hist = hist[len(hist)-50:]
-		}
-		m.history[sid] = hist
+		m.recordInput(text)
 		// No optimistic echo — the USER turn arrives as a chat.turn event.
 		m.client.Send(protocol.ChatInput(sid, text, m.chatMode))
 		m.clearInput()
@@ -907,8 +950,26 @@ func (m *Model) listNav(dir int) {
 	m.wfIndex = -1
 }
 
+// recordInput appends a submitted line to the global history ring (shared across
+// free-chat, the workflow-intent line, and in-session chat), deduping the immediate
+// repeat and capping the ring. Called from every submit path so ↑/↓ recalls anything
+// you've sent, in any input context.
+func (m *Model) recordInput(text string) {
+	text = strings.TrimSpace(text)
+	if text == "" {
+		return
+	}
+	if n := len(m.inputHistory); n > 0 && m.inputHistory[n-1] == text {
+		return
+	}
+	m.inputHistory = append(m.inputHistory, text)
+	if len(m.inputHistory) > 100 {
+		m.inputHistory = m.inputHistory[len(m.inputHistory)-100:]
+	}
+}
+
 func (m *Model) historyPrev() {
-	hist := m.history[m.selectedID]
+	hist := m.inputHistory
 	if len(hist) == 0 {
 		return
 	}
@@ -926,7 +987,7 @@ func (m *Model) historyPrev() {
 }
 
 func (m *Model) historyNext() {
-	hist := m.history[m.selectedID]
+	hist := m.inputHistory
 	switch {
 	case m.historyIndex == -1:
 		return